diff --git a/VisualNovel/app/src/main/java/com/remax/visualnovel/utils/SpUtil.kt b/VisualNovel/app/src/main/java/com/remax/visualnovel/utils/SpUtil.kt
new file mode 100644
index 0000000..fbeb25e
--- /dev/null
+++ b/VisualNovel/app/src/main/java/com/remax/visualnovel/utils/SpUtil.kt
@@ -0,0 +1,149 @@
+package com.remax.visualnovel.utils
+
+import android.content.Context
+import android.content.SharedPreferences
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+import com.remax.visualnovel.configs.NovelApplication
+import java.io.File
+
+class SpUtil private constructor(private val mUserId: Int) {
+    
+    companion object {
+        private const val Global = -999
+        private const val SP_NAME_PREFIX = "sp_data_"
+        private var mAppContext: Context = NovelApplication.appContext()
+        
+
+        private val mInstanceMap = mutableMapOf<Int, SpUtil>()
+        
+
+        fun init() {
+        }
+
+        
+        /**
+         * Specified user sp
+         */
+        fun getInstance(userId: Int = Global): SpUtil {
+            return mInstanceMap.getOrPut(userId) {
+                SpUtil(userId)
+            }
+        }
+        
+        /**
+         * clear specified user all sp info
+         */
+        fun clearInstance(userId: Int? = Global) {
+            val key = userId ?: Global
+            val instance = mInstanceMap.remove(key)
+            instance?.deleteSpFile()
+        }
+
+    }
+
+
+
+    private val mGson = Gson()
+    private val mSharePre: SharedPreferences
+    init {
+        val spName = "${SP_NAME_PREFIX}$mUserId"
+        mSharePre = mAppContext.getSharedPreferences(spName, Context.MODE_PRIVATE)
+    }
+    
+
+
+    
+    // -------------------- clear delete --------------------
+    private fun getUserSpFile() = "shared_prefs/${SP_NAME_PREFIX}$mUserId.xml"
+
+    private fun deleteSpFile(): Boolean {
+        return try {
+            val file = File(mAppContext.filesDir.parent, getUserSpFile())
+            if (file.exists()) {
+                clear()
+                file.delete()
+            } else {
+                false
+            }
+        } catch (e: Exception) {
+            e.printStackTrace()
+            false
+        }
+    }
+
+    
+    // -------------------- basic data type --------------------
+    fun putString(key: String, value: String) = withEditor { putString(key, value) }
+    fun getString(key: String, default: String = ""): String = mSharePre.getString(key, default) ?: default
+    fun putInt(key: String, value: Int) = withEditor { putInt(key, value) }
+    fun getInt(key: String, default: Int = 0): Int = mSharePre.getInt(key, default)
+    fun putLong(key: String, value: Long) = withEditor { putLong(key, value) }
+    fun getLong(key: String, default: Long = 0L): Long = mSharePre.getLong(key, default)
+    fun putFloat(key: String, value: Float) = withEditor { putFloat(key, value) }
+    fun getFloat(key: String, default: Float = 0f): Float = mSharePre.getFloat(key, default)
+    fun putBoolean(key: String, value: Boolean) = withEditor { putBoolean(key, value) }
+    fun getBoolean(key: String, default: Boolean = false): Boolean = mSharePre.getBoolean(key, default)
+    
+
+
+    // -------------------- complicate object --------------------
+    fun <T> putObject(key: String, value: T?) {
+        if (value == null) {
+            remove(key)
+            return
+        }
+        val json = mGson.toJson(value)
+        putString(key, json)
+    }
+
+    inline fun <reified T> getObject(key: String, default: T? = null): T? {
+        val json = getString(key)
+        if (json.isEmpty()) return default
+        
+        return try {
+            Gson().fromJson(json, T::class.java)
+        } catch (e: Exception) {
+            e.printStackTrace()
+            default
+        }
+    }
+    
+
+    fun <T> putList(key: String, list: List<T>?) {
+        if (list == null) {
+            remove(key)
+            return
+        }
+        val json = mGson.toJson(list)
+        putString(key, json)
+    }
+    
+
+    inline fun <reified T> getList(key: String, default: List<T> = emptyList()): List<T> {
+        val json = getString(key)
+        if (json.isEmpty()) return default
+        
+        return try {
+            val type = object : TypeToken<List<T>>() {}.type
+            Gson().fromJson(json, type) ?: default
+        } catch (e: Exception) {
+            e.printStackTrace()
+            default
+        }
+    }
+    
+
+    fun remove(key: String) = withEditor { remove(key) }
+    fun clear() = withEditor { clear() }
+    fun contains(key: String): Boolean = mSharePre.contains(key)
+
+    private inline fun withEditor(action: SharedPreferences.Editor.() -> Unit) {
+        mSharePre.edit().apply {
+            action()
+            apply()
+        }
+    }
+
+
+}
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