diff --git a/CustomKeyboard/Network/KBStreamFetcher.m b/CustomKeyboard/Network/KBStreamFetcher.m
index 32517d0..2dd5605 100644
--- a/CustomKeyboard/Network/KBStreamFetcher.m
+++ b/CustomKeyboard/Network/KBStreamFetcher.m
@@ -14,6 +14,7 @@
 @property (nonatomic, assign) NSInteger decodedPrefixBytes;    // 已解码并写入 sseTextBuffer 的字节数（SSE）
 @property (nonatomic, assign) NSInteger deliveredCharCount;    // 已回传的字符数（非 SSE，用于做增量）
 @property (nonatomic, assign) BOOL hasEmitted;                 // 是否已经输出过正文（用于“首段删 1 个 \t”）
+@property (nonatomic, assign) BOOL lastChunkEndedWithTab;      // 上一个已输出分片是否以 "\t" 结尾（用于跨分片去除“\t 后空格”）
 @property (nonatomic, strong) NSMutableArray<NSString *> *pendingQueue; // 待回调的分片（节流输出）
 @property (nonatomic, strong) NSTimer *flushTimer;             // 定时从队列取出一条回调
 @property (nonatomic, strong, nullable) NSError *finishError;  // 结束时的错误（需要等队列清空再回调）
@@ -57,7 +58,7 @@ static NSUInteger kb_validUTF8PrefixLen(NSData *data) {
         _buffer = [NSMutableData data];
         _sseTextBuffer = [NSMutableString string];
         _pendingQueue = [NSMutableArray array];
-        _flushInterval = 0.10;
+        _flushInterval = 0.1;
         _splitLargeDeltasOnWhitespace = YES;
     }
     return self;
@@ -90,6 +91,7 @@ static NSUInteger kb_validUTF8PrefixLen(NSData *data) {
     self.decodedPrefixBytes = 0;
     self.deliveredCharCount = 0;
     self.hasEmitted = NO;
+    self.lastChunkEndedWithTab = NO;
     [self.pendingQueue removeAllObjects];
     [self.flushTimer invalidate]; self.flushTimer = nil;
     self.finishError = nil;
@@ -108,6 +110,7 @@ static NSUInteger kb_validUTF8PrefixLen(NSData *data) {
     self.decodedPrefixBytes = 0;
     self.deliveredCharCount = 0;
     self.hasEmitted = NO;
+    self.lastChunkEndedWithTab = NO;
     [self.pendingQueue removeAllObjects];
     [self.flushTimer invalidate]; self.flushTimer = nil;
     self.finishError = nil;
@@ -251,26 +254,37 @@ static NSUInteger kb_validUTF8PrefixLen(NSData *data) {
 - (void)emitChunk:(NSString *)rawText {
     if (rawText.length == 0) return;
     NSString *text = rawText;
+    // 1) 统一处理 “/t” -> “\t”
     if (self.treatSlashTAsTab) {
         text = [text stringByReplacingOccurrencesOfString:@"/t" withString:@"\t"];
     }
+    // 2) 仅在整体首段：去掉一个起始的 "\t"，以及其后紧邻的一个空格（若存在）
     if (!self.hasEmitted && self.trimLeadingTabOnce) {
-        // 跳过前导空白，只删除“一个”起始的 \t
-        NSUInteger i = 0;
-        while (i < text.length) {
-            unichar c = [text characterAtIndex:i];
-            if (c == ' ' || c == '\r' || c == '\n') { i++; continue; }
-            break;
-        }
-        if (i < text.length && [text characterAtIndex:i] == '\t') {
-            NSMutableString *m = [text mutableCopy];
-            [m deleteCharactersInRange:NSMakeRange(i, 1)];
-            text = m;
+        if (text.length > 0 && [text characterAtIndex:0] == '\t') {
+            NSUInteger start = 1;
+            if (start < text.length && [text characterAtIndex:start] == ' ') start++;
+            text = [text substringFromIndex:start];
         }
     }
-    if (text.length == 0) return;
+    // 3) 从第二段开始：去掉每个段首的一个空格（即 “\t ” -> “\t”），跨分片也处理
+    if (text.length > 0) {
+        // 跨分片：若上个分片以 \t 结尾，本分片起始的一个或多个空格去掉一个
+        if (self.lastChunkEndedWithTab) {
+            NSUInteger j = 0;
+            while (j < text.length && [text characterAtIndex:j] == ' ') { j++; }
+            if (j > 0) {
+                text = [text substringFromIndex:1]; // 仅去一个空格
+            }
+        }
+        // 同一分片内：将 “\t ” 规范化为 “\t”（仅去一个空格）
+        text = [text stringByReplacingOccurrencesOfString:@"\t " withString:@"\t"];
+    }
+    if (text.length == 0) { self.lastChunkEndedWithTab = NO; return; }
     if (self.onChunk) dispatch_async(dispatch_get_main_queue(), ^{ self.onChunk(text); });
     self.hasEmitted = YES;
+    // 记录末尾是否为分段分隔符 \t（用于跨分片处理）
+    unichar lastc = [text characterAtIndex:text.length - 1];
+    self.lastChunkEndedWithTab = (lastc == '\t');
 }
 
 #pragma mark - Queue/Flush
diff --git a/CustomKeyboard/View/KBFunctionView.m b/CustomKeyboard/View/KBFunctionView.m
index 43dc252..98ee941 100644
--- a/CustomKeyboard/View/KBFunctionView.m
+++ b/CustomKeyboard/View/KBFunctionView.m
@@ -312,7 +312,7 @@ static NSString * const kKBStreamDemoURL = @"http://192.168.1.144:7529/api/demo/
 
 - (void)kb_startNetworkStreamingWithSeed:(NSString *)seedTitle fallbackToMock:(BOOL)fallback {
     [self kb_stopNetworkStreaming];
-    if (![[KBFullAccessManager shared] hasFullAccess]) { if (fallback) [self kb_startMockStreamingWithSeed:seedTitle]; return; }
+    if (![[KBFullAccessManager shared] hasFullAccess]) { if (fallback) /*[self kb_startMockStreamingWithSeed:seedTitle]*/; return; }
 
     NSURL *url = [NSURL URLWithString:kKBStreamDemoURL];
     if (!url) { if (fallback) [self kb_startMockStreamingWithSeed:seedTitle]; return; }
@@ -323,8 +323,10 @@ static NSString * const kKBStreamDemoURL = @"http://192.168.1.144:7529/api/demo/
     // 由本类统一做 /t->\t 与首段去 \t，fetcher 只负责增量与协议解析
     fetcher.disableCompression = YES;
     fetcher.acceptEventStream = NO;  // 响应头若是 SSE 仍会自动解析
-    fetcher.treatSlashTAsTab = NO;
-    fetcher.trimLeadingTabOnce = NO;
+    // 将 \t 与首段去 \t 的处理下沉到 Fetcher，避免 UI 抖动
+    fetcher.treatSlashTAsTab = YES;
+    fetcher.trimLeadingTabOnce = YES;
+    fetcher.flushInterval = 0.05; // 更接近“立刻显示”的节奏
     fetcher.onChunk = ^(NSString *chunk) {
         __strong typeof(weakSelf) self = weakSelf; if (!self) return;
         [self kb_appendChunkToStreamView:chunk];
@@ -351,27 +353,11 @@ static NSString * const kKBStreamDemoURL = @"http://192.168.1.144:7529/api/demo/
 #pragma mark - Helpers
 
 /// 统一处理需要输出到 KBStreamTextView 的分片：
-/// - 将 "/t" 转为真正的制表符 "\t"；
-/// - 若这是首段输出且文本起始（允许有前导空白）紧跟一个 "\t"，只删除这一个；
-/// - 非空才追加到视图，并标记已输出。
+/// - 目前网络层（KBStreamFetcher）已做 “/t->\t、首段去一个 \t、段间去一个空格”
+/// - 这里仅负责附加到视图与标记首段状态，避免 UI 抖动
 - (void)kb_appendChunkToStreamView:(NSString *)chunk {
     if (chunk.length == 0 || !self.streamTextView) return;
-    NSString *text = [chunk stringByReplacingOccurrencesOfString:@"/t" withString:@"\t"];
-    if (!self.streamHasOutput) {
-        NSUInteger i = 0; // 跳过前导空白
-        while (i < text.length) {
-            unichar c = [text characterAtIndex:i];
-            if (c == ' ' || c == '\r' || c == '\n') { i++; continue; }
-            break;
-        }
-        if (i < text.length && [text characterAtIndex:i] == '\t') {
-            NSMutableString *m = [text mutableCopy];
-            [m deleteCharactersInRange:NSMakeRange(i, 1)];
-            text = m;
-        }
-    }
-    if (text.length == 0) return;
-    [self.streamTextView appendStreamText:text];
+    [self.streamTextView appendStreamText:chunk];
     self.streamHasOutput = YES;
 }
 
diff --git a/CustomKeyboard/View/KBStreamTextView.m b/CustomKeyboard/View/KBStreamTextView.m
index 31df995..caf3f6c 100644
--- a/CustomKeyboard/View/KBStreamTextView.m
+++ b/CustomKeyboard/View/KBStreamTextView.m
@@ -62,6 +62,20 @@
     [self addSubview:_scrollView];
 }
 
+#pragma mark - Helpers
+
+// 仅去掉末尾空白/换行（保留前导空白，避免“段落在完成时向左跳动”）
+static inline NSString *KBTrimRight(NSString *s) {
+    if (s.length == 0) return s;
+    NSCharacterSet *set = [NSCharacterSet whitespaceAndNewlineCharacterSet];
+    NSInteger end = (NSInteger)s.length - 1;
+    while (end >= 0 && [set characterIsMember:[s characterAtIndex:(NSUInteger)end]]) {
+        end--;
+    }
+    if (end < 0) return @"";
+    return [s substringToIndex:(NSUInteger)end + 1];
+}
+
 #pragma mark - Public API
 
 // 边输边见：实时更新当前 label 文本，遇到分隔符就新建下一个 label
@@ -98,14 +112,11 @@
     self.labels.lastObject.text = self.buffer; // 不裁剪，保留实时输入
     [self layoutLabelsForCurrentWidth];
 
-    // 2) 处理每一个分隔符：完成当前段（可选裁剪）并新建空标签，然后填入下一段的内容
+    // 2) 处理每一个分隔符：完成当前段（仅裁剪“末尾空白”）并新建空标签，然后填入下一段的内容
     for (NSUInteger i = 1; i < parts.count; i++) {
         // a) 完成当前段：对外观进行最终裁剪（若开启）
         UILabel *current = self.labels.lastObject;
-        if (self.shouldTrimSegments) {
-            NSString *trimmed = [current.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
-            current.text = trimmed;
-        }
+        if (self.shouldTrimSegments) { current.text = KBTrimRight(current.text ?: @""); }
         [self layoutLabelsForCurrentWidth];
 
         // b) 新建一个空标签，代表下一个段（即刻创建，哪怕下一段当前为空）
@@ -133,9 +144,7 @@
 #pragma mark - Layout Helpers
 
 - (void)addLabelForText:(NSString *)text {
-    if (self.shouldTrimSegments) {
-        text = [text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
-    }
+    if (self.shouldTrimSegments) { text = KBTrimRight(text ?: @""); }
     // 创建一个可换行、可点击的 UILabel
     UILabel *label = [[UILabel alloc] initWithFrame:CGRectZero];
     label.numberOfLines = 0;
@@ -195,7 +204,7 @@
     UILabel *current = self.labels.lastObject;
     if (!current) { return; }
     if (self.shouldTrimSegments) {
-        NSString *trimmed = [current.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
+        NSString *trimmed = KBTrimRight(current.text ?: @"");
         current.text = trimmed;
         self.buffer = trimmed;
     }