diff --git a/app/build.gradle b/app/build.gradle
index 8528d609..3b4af497 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -305,11 +305,6 @@ dependencies {
     //Location 是一个通过 Android 自带的 LocationManager 来实现的定位功能：https://github.com/jenly1314/Location
     implementation 'com.github.pppscn:location:1.0.0'
 
-    //crontab解析库：https://github.com/jmrozanec/cron-utils 官网：http://cron-parser.com
-    //implementation 'com.cronutils:cron-utils:9.2.1'
-    //JSR-310 backport for Android：https://github.com/JakeWharton/ThreeTenABP
-    //implementation 'com.jakewharton.threetenabp:threetenabp:1.4.6'
-
     //Partial implementation of Quartz Cron Java for Android: https://github.com/gatewayapps/crondroid
     implementation 'gatewayapps.crondroid:crondroid:1.0.0'
     //Java Parser For Cron Expressions: https://github.com/grahamar/cron-parser
@@ -317,8 +312,6 @@ dependencies {
 
     //侧边栏菜单：https://github.com/yarolegovich/SlidingRootNav
     implementation 'com.yarolegovich:sliding-root-nav:1.1.1'
-    //TabBar：https://github.com/xuexiangjys/JPTabBar
-    // implementation 'com.github.xuexiangjys:JPTabBar:1.0.1'
 }
 //自动添加X-Library依赖
 apply from: 'x-library.gradle'
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 140613ac..8a2e5f25 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -305,3 +305,7 @@
 
 # MultiLanguages
 -keep class com.hjq.language.** {*;}
+
+# crontab解析
+-keep class gatewayapps.crondroid.** { *; }
+-keep class net.redhogs.cronparser.** { *; }
diff --git a/app/src/main/java/com/idormy/sms/forwarder/fragment/condition/CronFragment.kt b/app/src/main/java/com/idormy/sms/forwarder/fragment/condition/CronFragment.kt
index f149994b..ece5fede 100644
--- a/app/src/main/java/com/idormy/sms/forwarder/fragment/condition/CronFragment.kt
+++ b/app/src/main/java/com/idormy/sms/forwarder/fragment/condition/CronFragment.kt
@@ -2,6 +2,7 @@ package com.idormy.sms.forwarder.fragment.condition
 
 import android.annotation.SuppressLint
 import android.content.Intent
+import android.os.Build
 import android.text.Editable
 import android.text.TextWatcher
 import android.view.LayoutInflater
@@ -161,7 +162,8 @@ class CronFragment : BaseFragment<FragmentTasksConditionCronBinding?>(), View.On
                     times++
                 }
                 binding!!.tvDescription.text = description
-                binding!!.tvCronExpressionCheckTips.text = "$expression\n$description"
+                //TODO：低版本Android解析Cron表达式会报错，暂时不处理
+                binding!!.tvCronExpressionCheckTips.text = if (expression == description) expression else "$expression\n$description"
                 binding!!.tvNextTimeList.text = String.format(getString(R.string.next_execution_times), times.toString(), nextTimeList.joinToString("\n"))
                 binding!!.tvNextTimeList.visibility = View.VISIBLE
                 binding!!.separatorCronExpressionCheck.visibility = View.VISIBLE
@@ -1589,14 +1591,19 @@ class CronFragment : BaseFragment<FragmentTasksConditionCronBinding?>(), View.On
         //判断cronExpression是否有效
         CronExpression.validateExpression(expression)
 
-        //生成cron表达式描述
-        val options = Options()
-        options.isTwentyFourHourTime = true
-        //TODO：支持多语言
-        val locale = Locale.getDefault()
-        //Chinese, Japanese, Korean and other East Asian languages have no spaces between words
-        options.isNeedSpaceBetweenWords = locale == Locale("zh") || locale == Locale("ja") || locale == Locale("ko")
-        description = CronExpressionDescriptor.getDescription(expression, options, locale)
+        //TODO：低版本Android解析Cron表达式会报错，暂时不处理
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            //生成cron表达式描述
+            val options = Options()
+            options.isTwentyFourHourTime = true
+            //TODO：支持多语言
+            val locale = Locale.getDefault()
+            //Chinese, Japanese, Korean and other East Asian languages have no spaces between words
+            options.isNeedSpaceBetweenWords = locale == Locale("zh") || locale == Locale("ja") || locale == Locale("ko")
+            description = CronExpressionDescriptor.getDescription(expression, options, locale)
+        } else {
+            description = expression
+        }
 
         return CronSetting(description, expression)
     }