diff --git a/OpenIMSDK.podspec b/OpenIMSDK.podspec
index 63f42bd..ceadafe 100644
--- a/OpenIMSDK.podspec
+++ b/OpenIMSDK.podspec
@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'OpenIMSDK'
-  s.version          = '3.5.1'
+  s.version          = '3.5.1+1'
   s.summary          = 'Open-IM-SDK'
 
 # This description is used to generate tags and improve search results.
diff --git a/OpenIMSDK/Interface/OIMManager.m b/OpenIMSDK/Interface/OIMManager.m
index 9751719..04b7d7a 100644
--- a/OpenIMSDK/Interface/OIMManager.m
+++ b/OpenIMSDK/Interface/OIMManager.m
@@ -6,13 +6,13 @@
 //
 
 #import "OIMManager.h"
-#import "Reachability.h"
+#import "OIMReachability.h"
 #import "CallbackProxy.h"
 
 @interface OIMManager ()
 {
     OIMCallbacker *_callbacker;
-    Reachability *internetReachability;
+    OIMReachability *internetReachability;
 }
 
 @end
@@ -50,7 +50,7 @@ - (instancetype)init {
                                                      name:kReachabilityChangedNotification
                                                    object:nil];
         
-        internetReachability = [Reachability reachabilityForInternetConnection];
+        internetReachability = [OIMReachability reachabilityForInternetConnection];
         [internetReachability startNotifier];
     }
     
@@ -105,8 +105,8 @@ - (void)applicationWillEnterForeground:(NSNotification *)note {
 }
 
 - (void)reachabilityChanged:(NSNotification *)note {
-    Reachability *reachability = [note object];
-    NSParameterAssert([reachability isKindOfClass:[Reachability class]]);
+    OIMReachability *reachability = [note object];
+    NSParameterAssert([reachability isKindOfClass:[OIMReachability class]]);
 
     CallbackProxy *callback = [[CallbackProxy alloc]initWithOnSuccess:^(NSString * _Nullable data) {
         
diff --git a/OpenIMSDK/Model/OIMCustomElem.h b/OpenIMSDK/Model/OIMCustomElem.h
index 1b43d17..5060bf5 100644
--- a/OpenIMSDK/Model/OIMCustomElem.h
+++ b/OpenIMSDK/Model/OIMCustomElem.h
@@ -15,7 +15,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @property (nonatomic, nullable, copy) NSString *extension;
 
-@property (nonatomic, nullable, copy) NSString *description;
+@property (nonatomic, nullable, copy) NSString *description_;
 
 @end
 
diff --git a/OpenIMSDK/Model/OIMCustomElem.m b/OpenIMSDK/Model/OIMCustomElem.m
index 39805ad..e7aeaf2 100644
--- a/OpenIMSDK/Model/OIMCustomElem.m
+++ b/OpenIMSDK/Model/OIMCustomElem.m
@@ -6,7 +6,12 @@
 //
 
 #import "OIMCustomElem.h"
+#import <MJExtension/MJExtension.h>
 
 @implementation OIMCustomElem
-@synthesize description;
+
++ (NSDictionary *)mj_replacedKeyFromPropertyName {
+    return @{@"description_" : @"description"};
+}
+
 @end
diff --git a/OpenIMSDK/Utils/Reachability.h b/OpenIMSDK/Utils/OIMReachability.h
similarity index 97%
rename from OpenIMSDK/Utils/Reachability.h
rename to OpenIMSDK/Utils/OIMReachability.h
index 50c048c..f95c4d7 100644
--- a/OpenIMSDK/Utils/Reachability.h
+++ b/OpenIMSDK/Utils/OIMReachability.h
@@ -24,7 +24,7 @@ typedef enum : NSInteger {
 extern NSString *kReachabilityChangedNotification;
 
 
-@interface Reachability : NSObject
+@interface OIMReachability : NSObject
 
 /*!
  * Use to check the reachability of a given host name.
diff --git a/OpenIMSDK/Utils/Reachability.m b/OpenIMSDK/Utils/OIMReachability.m
similarity index 94%
rename from OpenIMSDK/Utils/Reachability.m
rename to OpenIMSDK/Utils/OIMReachability.m
index f081a16..d671aa3 100644
--- a/OpenIMSDK/Utils/Reachability.m
+++ b/OpenIMSDK/Utils/OIMReachability.m
@@ -14,7 +14,7 @@
 
 #import <CoreFoundation/CoreFoundation.h>
 
-#import "Reachability.h"
+#import "OIMReachability.h"
 
 #pragma mark IPv6 Support
 //Reachability fully support IPv6.  For full details, see ReadMe.md.
@@ -52,9 +52,9 @@ static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReach
 {
 #pragma unused (target, flags)
 	NSCAssert(info != NULL, @"info was NULL in ReachabilityCallback");
-	NSCAssert([(__bridge NSObject*) info isKindOfClass: [Reachability class]], @"info was wrong class in ReachabilityCallback");
+	NSCAssert([(__bridge NSObject*) info isKindOfClass: [OIMReachability class]], @"info was wrong class in ReachabilityCallback");
 
-    Reachability* noteObject = (__bridge Reachability *)info;
+    OIMReachability* noteObject = (__bridge OIMReachability *)info;
     // Post a notification to notify the client that the network reachability changed.
     [[NSNotificationCenter defaultCenter] postNotificationName: kReachabilityChangedNotification object: noteObject];
 }
@@ -62,14 +62,14 @@ static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReach
 
 #pragma mark - Reachability implementation
 
-@implementation Reachability
+@implementation OIMReachability
 {
 	SCNetworkReachabilityRef _reachabilityRef;
 }
 
 + (instancetype)reachabilityWithHostName:(NSString *)hostName
 {
-	Reachability* returnValue = NULL;
+    OIMReachability* returnValue = NULL;
 	SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, [hostName UTF8String]);
 	if (reachability != NULL)
 	{
@@ -90,7 +90,7 @@ + (instancetype)reachabilityWithAddress:(const struct sockaddr *)hostAddress
 {
 	SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, hostAddress);
 
-	Reachability* returnValue = NULL;
+    OIMReachability* returnValue = NULL;
 
 	if (reachability != NULL)
 	{