diff --git a/app/src/main/java/io/legado/app/data/entities/BaseBook.kt b/app/src/main/java/io/legado/app/data/entities/BaseBook.kt
new file mode 100644
index 000000000..e3605d6f6
--- /dev/null
+++ b/app/src/main/java/io/legado/app/data/entities/BaseBook.kt
@@ -0,0 +1,6 @@
+package io.legado.app.data.entities
+
+interface BaseBook {
+    var variableMap: HashMap<String, String>?
+    fun putVariable(key: String, value: String)
+}
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/data/entities/Book.kt b/app/src/main/java/io/legado/app/data/entities/Book.kt
index b1a18961f..6c7a2e4b3 100644
--- a/app/src/main/java/io/legado/app/data/entities/Book.kt
+++ b/app/src/main/java/io/legado/app/data/entities/Book.kt
@@ -1,10 +1,15 @@
 package io.legado.app.data.entities
 
 import android.os.Parcelable
+import android.text.TextUtils.isEmpty
 import androidx.room.Entity
+import androidx.room.Ignore
 import androidx.room.Index
 import androidx.room.PrimaryKey
+import com.google.gson.Gson
 import io.legado.app.constant.AppConst.NOT_AVAILABLE
+import io.legado.app.utils.fromJson
+import kotlinx.android.parcel.IgnoredOnParcel
 import kotlinx.android.parcel.Parcelize
 
 @Parcelize
@@ -40,7 +45,10 @@ data class Book(
     var order: Int = 0,                         // 手动排序
     var useReplaceRule: Boolean = true,         // 正文使用净化替换规则
     var variable: String? = null                // 自定义书籍变量信息(用于书源规则检索书籍信息)
-) : Parcelable {
+) : Parcelable, BaseBook {
+    @IgnoredOnParcel
+    @Ignore
+    override var variableMap: HashMap<String, String>? = null
 
     fun getUnreadChapterNum() = Math.max(totalChapterNum - durChapterIndex - 1, 0)
 
@@ -52,4 +60,17 @@ data class Book(
 
     fun getDisplayDescription() = customDescription ?: description
 
+    private fun initVariableMap() {
+        if (variableMap == null) {
+            variableMap = if (isEmpty(variable)) {
+                HashMap()
+            } else {
+                Gson().fromJson<HashMap<String, String>>(variable!!)
+            }
+        }
+    }
+
+    override fun putVariable(key: String, value: String) {
+        initVariableMap()
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/main/myconfig/PreferenceFragment.kt b/app/src/main/java/io/legado/app/ui/main/myconfig/PreferenceFragment.kt
index a440d76f2..d3f862d20 100644
--- a/app/src/main/java/io/legado/app/ui/main/myconfig/PreferenceFragment.kt
+++ b/app/src/main/java/io/legado/app/ui/main/myconfig/PreferenceFragment.kt
@@ -6,6 +6,7 @@ import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
 import io.legado.app.App
 import io.legado.app.R
+import io.legado.app.ui.about.AboutActivity
 import io.legado.app.ui.config.ConfigActivity
 import io.legado.app.ui.config.ConfigViewModel
 import org.jetbrains.anko.startActivity
@@ -39,19 +40,20 @@ class PreferenceFragment : PreferenceFragmentCompat(), SharedPreferences.OnShare
             when (preference.key) {
                 "setting" -> {
                     requireContext().startActivity<ConfigActivity>(
-                        Pair("configType", ConfigViewModel.TYPE_CONFIG)
+                            Pair("configType", ConfigViewModel.TYPE_CONFIG)
                     )
                 }
                 "web_dav_setting" -> {
                     requireContext().startActivity<ConfigActivity>(
-                        Pair("configType", ConfigViewModel.TYPE_WEB_DAV_CONFIG)
+                            Pair("configType", ConfigViewModel.TYPE_WEB_DAV_CONFIG)
                     )
                 }
                 "theme_setting" -> {
                     requireContext().startActivity<ConfigActivity>(
-                        Pair("configType", ConfigViewModel.TYPE_THEME_CONFIG)
+                            Pair("configType", ConfigViewModel.TYPE_THEME_CONFIG)
                     )
                 }
+                "about" -> requireContext().startActivity<AboutActivity>()
             }
         }
         return super.onPreferenceTreeClick(preference)
diff --git a/app/src/main/java/io/legado/app/utils/GsonExtensions.kt b/app/src/main/java/io/legado/app/utils/GsonExtensions.kt
new file mode 100644
index 000000000..7a5b315c9
--- /dev/null
+++ b/app/src/main/java/io/legado/app/utils/GsonExtensions.kt
@@ -0,0 +1,5 @@
+package io.legado.app.utils
+
+import com.google.gson.Gson
+
+inline fun <reified T> Gson.fromJson(json: String) = fromJson(json, T::class.java)
\ No newline at end of file
diff --git a/app/src/main/res/xml/pref_main.xml b/app/src/main/res/xml/pref_main.xml
index 4cc79904a..689bc4282 100644
--- a/app/src/main/res/xml/pref_main.xml
+++ b/app/src/main/res/xml/pref_main.xml
@@ -5,14 +5,12 @@
     <io.legado.app.lib.theme.prefs.ATESwitchPreference
         android:defaultValue="false"
         android:key="isNightTheme"
-        android:summary="开启/关闭暗色主题"
         android:title="暗色主题"
         app:iconSpaceReserved="false" />
 
     <io.legado.app.lib.theme.prefs.ATESwitchPreference
         android:defaultValue="false"
         android:key="webService"
-        android:summary="开启/关闭Web阅读和写源"
         android:title="Web服务"
         app:iconSpaceReserved="false" />
 
@@ -43,7 +41,7 @@
     <io.legado.app.lib.theme.prefs.ATEPreferenceCategory app:iconSpaceReserved="false">
 
         <androidx.preference.Preference
-            android:key="about"
+            android:key="donate"
             android:summary="您的支持是我更新的动力"
             android:title="@string/donate"
             app:iconSpaceReserved="false" />