diff --git a/trunk/conf/srs.conf b/trunk/conf/srs.conf
index b86e86dea..d234e1d71 100755
--- a/trunk/conf/srs.conf
+++ b/trunk/conf/srs.conf
@@ -26,6 +26,7 @@ vhost __defaultVhost__ {
 # for which cannot identify the required vhost.
 # for default demo.
 vhost demo.srs.com {
+    chunk_size      4096;
     enabled         on;
     gop_cache       on;
     queue_length    30;
@@ -138,6 +139,7 @@ vhost players_pub {
         hls_window      30;
     }
 }
+
 # for development
 vhost dev {
     enabled         on;
@@ -198,6 +200,15 @@ vhost dev {
     }
 }
 
+# set the chunk size of vhost.
+vhost chunksize.vhost.com {
+    # the default chunk size is 128, max is 65536,
+    # some client does not support chunk size change,
+    # vhost chunk size will override the global value.
+    # default: global chunk size.
+    chunk_size      128;
+}
+
 # the http hook callback vhost, srs will invoke the hooks for specified events.
 vhost hooks.callback.vhost.com {
     http_hooks {
@@ -289,6 +300,7 @@ vhost hooks.callback.vhost.com {
         on_stop         http://127.0.0.1:8085/api/v1/sessions http://localhost:8085/api/v1/sessions;
     }
 }
+
 # the mirror filter of ffmpeg, @see: http://ffmpeg.org/ffmpeg-filters.html#Filtering-Introduction
 vhost mirror.transcode.vhost.com {
     transcode {
@@ -668,6 +680,7 @@ vhost stream.transcode.vhost.com {
         }
     }
 }
+
 # the vhost which forward publish streams.
 vhost same.vhost.forward.vhost.com {
     # forward all publish stream to the specified server.
@@ -683,6 +696,7 @@ vhost same.vhost.forward.vhost.com {
 vhost change.vhost.forward.vhost.com {
     forward         127.0.0.1:1936?vhost=forward2.vhost.com 127.0.0.1:1937?vhost=forward3.vhost.com;
 }
+
 # the vhost disabled.
 vhost removed.vhost.com {
     # whether the vhost is enabled.
@@ -690,6 +704,7 @@ vhost removed.vhost.com {
     # default: on
     enabled         off;
 }
+
 # the vhost with hls specified.
 vhost with-hls.vhost.com {
     hls {
@@ -726,6 +741,7 @@ vhost no-hls.vhost.com {
         enabled         off;
     }
 }
+
 # the vhost for min delay, donot cache any stream.
 vhost min.delay.com {
     # whether cache the last gop.
@@ -743,6 +759,7 @@ vhost min.delay.com {
     # default: 30
     queue_length    10;
 }
+
 # the vhost for antisuck.
 vhost refer.anti_suck.com {
     # the common refer for play and publish.
@@ -761,6 +778,7 @@ vhost refer.anti_suck.com {
     # default: not specified.
     refer_play      github.com github.io;
 }
+
 # config for the pithy print,
 # which always print constant message specified by interval,
 # whatever the clients in concurrency.
diff --git a/trunk/src/core/srs_core_client.cpp b/trunk/src/core/srs_core_client.cpp
index c41bc62d2..9f778799b 100644
--- a/trunk/src/core/srs_core_client.cpp
+++ b/trunk/src/core/srs_core_client.cpp
@@ -173,7 +173,7 @@ int SrsClient::service_cycle()
 	req->strip();
 	srs_trace("identify client success. type=%d, stream_name=%s", type, req->stream.c_str());
 	
-	int chunk_size = config->get_chunk_size();
+    int chunk_size = config->get_chunk_size(req->vhost);
 	if ((ret = rtmp->set_chunk_size(chunk_size)) != ERROR_SUCCESS) {
 		srs_error("set chunk_size=%d failed. ret=%d", chunk_size, ret);
 		return ret;
diff --git a/trunk/src/core/srs_core_config.cpp b/trunk/src/core/srs_core_config.cpp
index 3e487d2b5..aa2d1a1e3 100644
--- a/trunk/src/core/srs_core_config.cpp
+++ b/trunk/src/core/srs_core_config.cpp
@@ -2,6 +2,7 @@
 The MIT License (MIT)
 
 Copyright (c) 2013 winlin
+Copyright (c) 2013 wenjiegit
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in
@@ -1442,14 +1443,27 @@ SrsConfDirective* SrsConfig::get_listen()
 	return root->get("listen");
 }
 
-int SrsConfig::get_chunk_size()
+int SrsConfig::get_chunk_size(const std::string &vhost)
 {
-	SrsConfDirective* conf = root->get("chunk_size");
-	if (!conf) {
+    SrsConfDirective* conf = get_vhost(vhost);
+
+    if (!conf) {
 		return SRS_CONF_DEFAULT_CHUNK_SIZE;
-	}
-	
-	return ::atoi(conf->arg0().c_str());
+    }
+
+    conf = conf->get("chunk_size");
+    if (!conf) {
+        // vhost does not specify the chunk size,
+        // use the global instead.
+		conf = root->get("chunk_size");
+		if (!conf) {
+			return SRS_CONF_DEFAULT_CHUNK_SIZE;
+		}
+		
+		return ::atoi(conf->arg0().c_str());
+    }
+
+    return ::atoi(conf->arg0().c_str());
 }
 
 int SrsConfig::get_pithy_print_publish()
diff --git a/trunk/src/core/srs_core_config.hpp b/trunk/src/core/srs_core_config.hpp
index b7ccf8d89..d165490ea 100644
--- a/trunk/src/core/srs_core_config.hpp
+++ b/trunk/src/core/srs_core_config.hpp
@@ -2,6 +2,7 @@
 The MIT License (MIT)
 
 Copyright (c) 2013 winlin
+Copyright (c) 2013 wenjiegit
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of
 this software and associated documentation files (the "Software"), to deal in
@@ -162,7 +163,7 @@ public:
 	virtual SrsConfDirective*	get_refer_play(std::string vhost);
 	virtual SrsConfDirective*	get_refer_publish(std::string vhost);
 	virtual SrsConfDirective*	get_listen();
-	virtual int					get_chunk_size();
+    virtual int					get_chunk_size(const std::string& vhost);
 	virtual int					get_pithy_print_publish();
 	virtual int					get_pithy_print_forwarder();
 	virtual int					get_pithy_print_encoder();