diff --git a/Podfile b/Podfile
index 80704acb..14554cdd 100644
--- a/Podfile
+++ b/Podfile
@@ -40,7 +40,7 @@ target 'xplan-ios' do
 	#pop动画
 	pod 'pop', '~> 1.0.12'
 	#云信
-	pod 'NIMSDK_LITE', '~> 7.8.3'
+	pod 'NIMSDK_LITE', '~> 9.0.1'
 	#下拉刷新控件
 	pod 'MJRefresh'
 	#登录的
diff --git a/Podfile.lock b/Podfile.lock
index 238c6c9e..ddd69082 100644
--- a/Podfile.lock
+++ b/Podfile.lock
@@ -47,7 +47,7 @@ PODS:
     - mob_sharesdk/ShareSDK
     - MOBFoundation (>= 3.2.9)
   - MOBFoundation (3.2.27)
-  - NIMSDK_LITE (7.8.5)
+  - NIMSDK_LITE (9.0.1)
   - NTESBaseComponent (1.4)
   - NTESQuickPass (3.2.6):
     - NTESBaseComponent
@@ -108,7 +108,7 @@ DEPENDENCIES:
   - mob_sharesdk/ShareSDKPlatforms/Apple
   - mob_sharesdk/ShareSDKPlatforms/QQ
   - mob_sharesdk/ShareSDKPlatforms/WeChat
-  - NIMSDK_LITE (~> 7.8.3)
+  - NIMSDK_LITE (~> 9.0.1)
   - NTESQuickPass
   - pop (~> 1.0.12)
   - QGVAPlayer
@@ -130,6 +130,7 @@ SPEC REPOS:
   https://mirrors.tuna.tsinghua.edu.cn/git/CocoaPods/Specs.git:
     - IQKeyboardManager
     - JXPagingView
+    - NIMSDK_LITE
     - NTESBaseComponent
     - NTESQuickPass
     - QGVAPlayer
@@ -151,7 +152,6 @@ SPEC REPOS:
     - MJRefresh
     - mob_sharesdk
     - MOBFoundation
-    - NIMSDK_LITE
     - pop
     - Protobuf
     - Qiniu
@@ -192,7 +192,7 @@ SPEC CHECKSUMS:
   MJRefresh: ec9c53ff4abf3a9237b4283862f1bd51c2ee3fdb
   mob_sharesdk: a60006891a079486ff3269ed326adfa05a967c01
   MOBFoundation: efdc3ce6b843fbc10ae8c1c6122a02b0d845b39b
-  NIMSDK_LITE: 8e28ae0a26dd1dccc4684b697381f0a72a733f51
+  NIMSDK_LITE: c376a3f90c1cd79d9cca39fbdeb6a718e99e244a
   NTESBaseComponent: 9e97373eec7e5a26c39db26477bf99a37ee9e71a
   NTESQuickPass: 781bd12ee63681389fe9b646c837fa76e3a00e6e
   pop: d582054913807fd11fd50bfe6a539d91c7e1a55a
@@ -215,6 +215,6 @@ SPEC CHECKSUMS:
   YYText: 5c461d709e24d55a182d1441c41dc639a18a4849
   YYWebImage: 5f7f36aee2ae293f016d418c7d6ba05c4863e928
 
-PODFILE CHECKSUM: f2682cf01b67e68f847979b09786b508a737bed6
+PODFILE CHECKSUM: d02ba4da989cc65b5e850b0ff42a9ef68dcc1f1e
 
 COCOAPODS: 1.11.2
diff --git a/xplan-ios/Main/Message/View/Session/SessionViewController.m b/xplan-ios/Main/Message/View/Session/SessionViewController.m
index bf23b1ce..2febd07a 100644
--- a/xplan-ios/Main/Message/View/Session/SessionViewController.m
+++ b/xplan-ios/Main/Message/View/Session/SessionViewController.m
@@ -9,6 +9,7 @@
 #import <Masonry/Masonry.h>
 #import <IQKeyboardManager/IQKeyboardManager.h>
 #import <TZImagePickerController/TZImagePickerController.h>
+#import <MJRefresh/MJRefresh.h>
 ///Tool
 #import "XCCurrentVCStackManager.h"
 #import "NIMMessageMaker.h"
@@ -44,6 +45,8 @@
 @property (nonatomic, strong) UserInfoModel *userInfo;
 ///输入框
 @property (nonatomic,strong) SessionToolbarView *toolbarView;
+///最后的一条消息
+@property (nonatomic,strong) NIMMessage *lastMessage;
 @end
 
 @implementation SessionViewController
@@ -73,12 +76,49 @@
     [super viewDidLoad];
 	[IQKeyboardManager sharedManager].enable = NO;
 	[IQKeyboardManager sharedManager].enableAutoToolbar = NO;
-    [self initData];
+	[self initHeaderAndFooterRrfresh];
     [[NIMSDK sharedSDK].chatManager addDelegate:self];
     [[NIMSDK sharedSDK].conversationManager addDelegate:self];
     [self.presenter getUserInfo:self.session.sessionId];
 }
 
+- (void)initHeaderAndFooterRrfresh {
+	MJRefreshNormalHeader *header = [MJRefreshNormalHeader headerWithRefreshingTarget:self refreshingAction:@selector(headerRefresh)];
+	header.stateLabel.font = [UIFont systemFontOfSize:10.0];
+	header.lastUpdatedTimeLabel.font = [UIFont systemFontOfSize:10.0];
+	header.stateLabel.textColor = [ThemeColor secondTextColor];
+	header.lastUpdatedTimeLabel.textColor = [ThemeColor secondTextColor];
+	self.sessionTableView.mj_header = header;
+	[self headerRefresh];
+	[self initData];
+}
+
+- (void)headerRefresh {
+	if (self.messages.count > 0) {
+		[[[NIMSDK sharedSDK] conversationManager] messagesInSession:self.session message:self.messages.firstObject limit:20 completion:^(NSError * _Nullable error, NSArray<NIMMessage *> * _Nullable messages) {
+			[self.sessionTableView.mj_header endRefreshing];
+			if (error == nil && messages.count > 0) {
+				for (int i = ((int)messages.count -1); i > 0; i--) {
+					NIMMessage * message = [messages objectAtIndex:i];
+					[self.messages insertObject:message atIndex:0];
+				}
+			}
+			[self.sessionTableView reloadData];
+		}];
+	} else {
+		[[[NIMSDK sharedSDK] conversationManager] messagesInSession:self.session message:nil limit:20 completion:^(NSError * _Nullable error, NSArray<NIMMessage *> * _Nullable messages) {
+			[self.sessionTableView.mj_header endRefreshing];
+			if (error == nil) {
+				[self.messages addObjectsFromArray:messages];
+			}
+			[self.sessionTableView reloadData];
+			[self.sessionTableView nim_scrollToBottom:NO];
+		}];
+	}
+	
+}
+
+#pragma mark - Private Method
 - (void)initViews {
     NIMUser * user = [[NIMSDK sharedSDK].userManager userInfo:self.session.sessionId];
     if (user) {
@@ -109,11 +149,6 @@
 }
 
 - (void)initData {
-    NSArray<NIMMessage *> *messages = [[NIMSDK sharedSDK].conversationManager messagesInSession:self.session message:nil limit:1000];
-    [self.messages addObjectsFromArray:messages.copy];
-    [self.sessionTableView reloadData];
-    [self.sessionTableView nim_scrollToBottom:NO];
-    
     [[NIMSDK sharedSDK].userManager fetchUserInfos:@[self.session.sessionId] completion:^(NSArray<NIMUser *> * _Nullable users, NSError * _Nullable error) {
         if (!error) {
             self.title = users[0].userInfo.nickName;
@@ -276,7 +311,7 @@
 	[self.toolbarView mas_updateConstraints:^(MASConstraintMaker *make) {
 		make.bottom.mas_equalTo(self.view).offset(-heightFromBottom);
 	}];
-	[self.sessionTableView nim_scrollToBottom:YES];
+	[self.sessionTableView nim_scrollToBottom:NO];
 }
 
 - (void)sendTextMessage:(NSString *)text {