diff --git a/widgets/TrojanGoSettingsWidget.cpp b/widgets/TrojanGoSettingsWidget.cpp
index 0c61d05..207c430 100644
--- a/widgets/TrojanGoSettingsWidget.cpp
+++ b/widgets/TrojanGoSettingsWidget.cpp
@@ -2,8 +2,11 @@
 
 #include "TrojanGoPlugin.hpp"
 
+#include <QDrag>
+#include <QDragEnterEvent>
 #include <QFileDialog>
 #include <QMessageBox>
+#include <QMimeData>
 
 TrojanGoSettingsWidget::TrojanGoSettingsWidget(QWidget *parent) : Qv2rayPlugin::QvPluginSettingsWidget(parent)
 {
@@ -23,11 +26,14 @@ void TrojanGoSettingsWidget::changeEvent(QEvent *e)
 std::tuple<KernelPathCheckerResult, std::optional<QString>> TrojanGoSettingsWidget::preliminaryKernelPathChecker(const QString &pathToKernel)
 {
     // some random extensions that doesn't seem to be a Trojan-Go kernel.
-    const QStringList nonKernelExtensions = { ".so", ".dll", ".dylib", ".zip", ".rar", ".gz", ".tar", ".xz" };
-    if (std::any_of(nonKernelExtensions.cbegin(), nonKernelExtensions.cend(),
-                    [&pathToKernel](const QString &extension) -> bool { return pathToKernel.endsWith(extension, Qt::CaseInsensitive); }))
-        return { KernelPathCheckerResult::KPCR_WARNING, tr("Suffix `%1` does not seem to be a Trojan-Go Core.\r\n"
-                                                           "It should be like `trojan-go` or `trojan-go.exe`.") };
+    const QStringList nonKernelExtensions = { ".so", ".dll", ".dylib", ".zip", ".rar", ".gz", ".tar", ".xz", ".txt" };
+    if (const auto it =
+            std::find_if(nonKernelExtensions.cbegin(), nonKernelExtensions.cend(),
+                         [&pathToKernel](const QString &extension) -> bool { return pathToKernel.endsWith(extension, Qt::CaseInsensitive); });
+        it != nonKernelExtensions.cend())
+        return { KernelPathCheckerResult::KPCR_WARNING, tr("The suffix `%1` does not seem to be of a Trojan-Go Core.\r\n"
+                                                           "Its filename should have been like `trojan-go` or `trojan-go.exe`.")
+                                                            .arg(*it) };
 
     // check the existance, read permission and file size issues.
     if (QFile kernelFile(pathToKernel); !kernelFile.exists())
@@ -43,50 +49,124 @@ std::tuple<KernelPathCheckerResult, std::optional<QString>> TrojanGoSettingsWidg
 
 void TrojanGoSettingsWidget::on_selectKernelBtn_clicked()
 {
-
-#if defined(Q_OS_MAC)
-    const static QString platformDefaultKernelDir = "/usr/local/bin";
-    const static QString platformKernelPathFilter = "Trojan-Go Core(trojan-go*);;All Files(*)";
-#elif defined(Q_OS_UNIX)
-    const static QString platformDefaultKernelDir = "/usr/bin";
-    const static QString platformKernelPathFilter = "Trojan-Go Core(trojan-go*);;All Files(*)";
-#elif defined(Q_OS_WIN)
-    const static QString platformDefaultKernelDir = "";
-    const static QString platformKernelPathFilter = "Trojan-Go Core(trojan-go.exe);;All Files(*)";
-#else
-    const static QString platformDefaultKernelDir = "";
-    const static QString platformKernelPathFilter = "";
-#endif
-
     const auto path = QFileDialog::getOpenFileName(this, tr("Select Trojan-Go Core"), platformDefaultKernelDir, platformKernelPathFilter);
     if (path.isEmpty())
         return;
 
-    const auto [result, someErrMsg] = this->preliminaryKernelPathChecker(path);
+    // debounce: disabling this button for now
+    selectKernelBtn->setEnabled(false);
+
+    if (handleKernelPathCheck(path))
+    {
+        settings.insert("kernelPath", path);
+        kernelPathTxt->setText(path);
+    }
+
+    // debounce: recover in 800ms
+    debounceTimer.singleShot(800, this, &TrojanGoSettingsWidget::debounceUnfreeze);
+}
+
+void TrojanGoSettingsWidget::debounceUnfreeze()
+{
+    selectKernelBtn->setEnabled(true);
+}
+
+bool TrojanGoSettingsWidget::handleKernelPathCheck(const QString &pathToCheck)
+{
+    const auto [result, someErrMsg] = this->preliminaryKernelPathChecker(pathToCheck);
     switch (result)
     {
         case KernelPathCheckerResult::KPCR_VERY_OK: break;
         case KernelPathCheckerResult::KPCR_FAILURE:
         {
             QMessageBox::critical(this, tr("Trojan-Go Core Path Check Failed"),
-                                  tr("Path `%1` did not pass kernel path checker:\r\n%2").arg(path, *someErrMsg));
-            return;
+                                  tr("Path `%1` did not pass kernel path checker:\r\n%2").arg(pathToCheck, *someErrMsg));
+            return false;
         }
         case KernelPathCheckerResult::KPCR_WARNING:
         {
-            const auto choice = QMessageBox::question(this, tr("Trojan-Go Core Path Warning"),
-                                                      tr("Path `%1` might not be the correct Trojan-Go kernel path:\r\n%2").arg(path, *someErrMsg),
-                                                      QMessageBox::Ignore | QMessageBox::Abort, QMessageBox::Abort);
+            const auto choice =
+                QMessageBox::question(this, tr("Trojan-Go Core Path Warning"),
+                                      tr("Path `%1` might not be the correct Trojan-Go kernel path:\r\n%2").arg(pathToCheck, *someErrMsg),
+                                      QMessageBox::Ignore | QMessageBox::Abort, QMessageBox::Abort);
             if (choice == QMessageBox::Abort)
-                return;
+                return false;
         }
     }
+    return true;
+}
+
+void TrojanGoSettingsWidget::dragEnterEvent(QDragEnterEvent *event)
+{
+    // accept only file-like drops
+    const auto mimeData = event->mimeData();
+    if (!mimeData->hasUrls())
+    {
+        event->ignore();
+        return;
+    }
+
+    // accept only single file drop
+    if (const auto &urlList = mimeData->urls(); urlList.isEmpty() || urlList.length() != 1)
+    {
+        event->ignore();
+        return;
+    }
+
+    // else: let the drag pass
+    event->acceptProposedAction();
+}
+
+void TrojanGoSettingsWidget::dropEvent(QDropEvent *event)
+{
+    const auto mimeData = event->mimeData();
+    if (!mimeData->hasUrls())
+    {
+        return;
+    }
 
-    settings.insert("kernelPath", path);
-    kernelPathTxt->setText(path);
+    const auto path = mimeData->urls().first().toLocalFile();
+    if (path.isEmpty())
+    {
+        return;
+    }
+
+    if (handleKernelPathCheck(path))
+    {
+        settings.insert("kernelPath", path);
+        kernelPathTxt->setText(path);
+    }
 }
 
-void TrojanGoSettingsWidget::on_kernelPathTxt_textEdited(const QString &arg1)
+void TrojanGoSettingsWidget::on_testKernelBtn_clicked()
 {
-    settings.insert("kernelPath", arg1);
+    const auto path = settings["kernelPath"].toString();
+    if (path.isEmpty())
+    {
+        QMessageBox::critical(this, tr("Nothing to Test"), tr("Kernel Path is empty."));
+        return;
+    }
+
+    QProcess process;
+#ifdef Q_OS_WIN32
+    process.setProgram(path);
+    process.setProcessChannelMode(QProcess::MergedChannels);
+    process.setNativeArguments("--version");
+    process.start();
+#else
+    process.start(path, { "--version" });
+#endif
+    process.waitForStarted();
+    process.waitForFinished();
+
+    const auto exitCode = process.exitCode();
+    if (exitCode != 0)
+    {
+        QMessageBox::critical(this, tr("Trojan-Go Core Test Failed"),
+                              tr("Trojan-Go Core failed with exit code %1.\r\nReason: %2").arg(exitCode).arg(process.errorString()));
+        return;
+    }
+
+    QString output = process.readAllStandardOutput();
+    QMessageBox::information(this, tr("Trojan-Go Test Result"), output);
 }
diff --git a/widgets/TrojanGoSettingsWidget.hpp b/widgets/TrojanGoSettingsWidget.hpp
index d7c20ed..47d59b3 100644
--- a/widgets/TrojanGoSettingsWidget.hpp
+++ b/widgets/TrojanGoSettingsWidget.hpp
@@ -3,6 +3,7 @@
 #include "interface/QvGUIPluginInterface.hpp"
 #include "ui_TrojanGoSettingsWidget.h"
 
+#include <QTimer>
 #include <optional>
 
 /**
@@ -44,13 +45,33 @@ class TrojanGoSettingsWidget
 
   protected:
     void changeEvent(QEvent *e) override;
+    void dragEnterEvent(QDragEnterEvent *event) override;
+    void dropEvent(QDropEvent *event) override;
 
   private slots:
+    void debounceUnfreeze();
     void on_selectKernelBtn_clicked();
-    void on_kernelPathTxt_textEdited(const QString &arg1);
+    void on_testKernelBtn_clicked();
 
   private:
     QJsonObject settings;
+    QTimer debounceTimer;
+
+  private:
+    // platform-dependent options.
+#if defined(Q_OS_MAC)
+    const inline static char *platformDefaultKernelDir = "/usr/local/bin";
+    const inline static char *platformKernelPathFilter = "Trojan-Go Core(trojan-go*);;All Files(*)";
+#elif defined(Q_OS_UNIX)
+    const inline static char *platformDefaultKernelDir = "/usr/bin";
+    const inline static char *platformKernelPathFilter = "Trojan-Go Core(trojan-go*);;All Files(*)";
+#elif defined(Q_OS_WIN)
+    const inline static char *platformDefaultKernelDir = "";
+    const inline static char *platformKernelPathFilter = "Trojan-Go Core(trojan-go.exe);;All Files(*)";
+#else
+    const inline static char *platformDefaultKernelDir = "";
+    const inline static char *platformKernelPathFilter = "";
+#endif
 
   private:
     /**
@@ -59,4 +80,12 @@ class TrojanGoSettingsWidget
      * @return if the kernel path check passes, and if not, the detailed error message.
      */
     std::tuple<KernelPathCheckerResult, std::optional<QString>> preliminaryKernelPathChecker(const QString &pathToKernel);
+
+    /**
+     * @brief The UI routine to handle kernel path check.
+     *        To be reused by multiple part of this program.
+     * @param pathToCheck the path to be checked.
+     * @return if the backend should accept the user input.
+     */
+    bool handleKernelPathCheck(const QString &pathToCheck);
 };
diff --git a/widgets/TrojanGoSettingsWidget.ui b/widgets/TrojanGoSettingsWidget.ui
index 845d334..ba1255b 100644
--- a/widgets/TrojanGoSettingsWidget.ui
+++ b/widgets/TrojanGoSettingsWidget.ui
@@ -6,35 +6,86 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>651</width>
-    <height>300</height>
+    <width>534</width>
+    <height>332</height>
    </rect>
   </property>
+  <property name="acceptDrops">
+   <bool>true</bool>
+  </property>
   <property name="windowTitle">
    <string>Form</string>
   </property>
   <layout class="QFormLayout" name="formLayout">
    <item row="0" column="0">
-    <widget class="QLabel" name="label">
+    <widget class="QLabel" name="kernelLabel">
      <property name="text">
-      <string>Trojan-Go Kernel Path</string>
+      <string>Kernel</string>
      </property>
     </widget>
    </item>
    <item row="0" column="1">
+    <widget class="QLineEdit" name="kernelPathTxt">
+     <property name="acceptDrops">
+      <bool>false</bool>
+     </property>
+     <property name="text">
+      <string notr="true"/>
+     </property>
+     <property name="dragEnabled">
+      <bool>false</bool>
+     </property>
+     <property name="readOnly">
+      <bool>true</bool>
+     </property>
+     <property name="placeholderText">
+      <string>(N/A)</string>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="0" colspan="2">
     <layout class="QHBoxLayout" name="horizontalLayout">
      <item>
-      <widget class="QLineEdit" name="kernelPathTxt"/>
+      <widget class="QPushButton" name="selectKernelBtn">
+       <property name="text">
+        <string>&amp;Browse...</string>
+       </property>
+      </widget>
      </item>
      <item>
-      <widget class="QPushButton" name="selectKernelBtn">
+      <widget class="QPushButton" name="testKernelBtn">
        <property name="text">
-        <string>Select Kernel</string>
+        <string>&amp;Test Run...</string>
        </property>
       </widget>
      </item>
     </layout>
    </item>
+   <item row="2" column="0" colspan="2">
+    <widget class="QLabel" name="notesLabel">
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Preferred" vsizetype="MinimumExpanding">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="text">
+      <string>&lt;h3&gt;Tips:&lt;/h3&gt;
+QvPlugin-Trojan-Go requires Trojan-Go Core to function well.
+&lt;br&gt;
+Please locate Trojan-Go kernel using &lt;b&gt;Browse...&lt;/b&gt; button, or by &lt;b&gt;dragging&lt;/b&gt; the kernel file in. Optionally, do a &lt;b&gt;Test Run&lt;/b&gt; before leaving.</string>
+     </property>
+     <property name="textFormat">
+      <enum>Qt::RichText</enum>
+     </property>
+     <property name="alignment">
+      <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>
+     </property>
+     <property name="wordWrap">
+      <bool>true</bool>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources/>