diff --git a/README.md b/README.md
index f9ec9c7f8..7103aa146 100755
--- a/README.md
+++ b/README.md
@@ -62,8 +62,8 @@ m3u8 url: http://127.0.0.1:1935/live/livestream.m3u8
 * nginx v1.5.0: 139524 lines <br/>
 
 ### History
-* v0.5, 2013-11-24, support HLS(m3u8).
-* v0.5, 2013-11-24, support write ts file.
+* v0.5, 2013-11-24, support HLS(m3u8), fragment and window.
+* v0.5, 2013-11-24, support record to ts file for HLS.
 * v0.5, 2013-11-21, add ts_info tool to demux ts file.
 * v0.5, 2013-11-16, add rtmp players(OSMF/jwplayer5/jwplayer6).
 * v0.4, 2013-11-10, v0.4 released. 12500 lines.
diff --git a/trunk/src/core/srs_core_config.cpp b/trunk/src/core/srs_core_config.cpp
index 50d809654..e8dde1853 100644
--- a/trunk/src/core/srs_core_config.cpp
+++ b/trunk/src/core/srs_core_config.cpp
@@ -595,6 +595,28 @@ SrsConfDirective* SrsConfig::get_hls_path(std::string vhost)
 	return conf->get("hls_path");
 }
 
+SrsConfDirective* SrsConfig::get_hls_fragment(std::string vhost)
+{
+	SrsConfDirective* conf = get_vhost(vhost);
+
+	if (!conf) {
+		return NULL;
+	}
+	
+	return conf->get("hls_fragment");
+}
+
+SrsConfDirective* SrsConfig::get_hls_window(std::string vhost)
+{
+	SrsConfDirective* conf = get_vhost(vhost);
+
+	if (!conf) {
+		return NULL;
+	}
+	
+	return conf->get("hls_window");
+}
+
 SrsConfDirective* SrsConfig::get_refer(std::string vhost)
 {
 	SrsConfDirective* conf = get_vhost(vhost);
diff --git a/trunk/src/core/srs_core_config.hpp b/trunk/src/core/srs_core_config.hpp
index 32d7d910a..2c0adeb88 100644
--- a/trunk/src/core/srs_core_config.hpp
+++ b/trunk/src/core/srs_core_config.hpp
@@ -38,6 +38,8 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define RTMP_VHOST_DEFAULT "__defaultVhost__"
 
 #define SRS_CONF_DEFAULT_HLS_PATH "./objs/nginx/html"
+#define SRS_CONF_DEFAULT_HLS_FRAGMENT 10
+#define SRS_CONF_DEFAULT_HLS_WINDOW 60
 
 class SrsFileBuffer
 {
@@ -111,6 +113,8 @@ public:
 	virtual SrsConfDirective* get_gop_cache(std::string vhost);
 	virtual SrsConfDirective* get_hls(std::string vhost);
 	virtual SrsConfDirective* get_hls_path(std::string vhost);
+	virtual SrsConfDirective* get_hls_fragment(std::string vhost);
+	virtual SrsConfDirective* get_hls_window(std::string vhost);
 	virtual SrsConfDirective* get_refer(std::string vhost);
 	virtual SrsConfDirective* get_refer_play(std::string vhost);
 	virtual SrsConfDirective* get_refer_publish(std::string vhost);
diff --git a/trunk/src/core/srs_core_hls.cpp b/trunk/src/core/srs_core_hls.cpp
index b8020dc20..b34a3022f 100644
--- a/trunk/src/core/srs_core_hls.cpp
+++ b/trunk/src/core/srs_core_hls.cpp
@@ -370,6 +370,7 @@ SrsHLS::SrsHLS()
 	jitter = new SrsRtmpJitter();
 	file_index = 0;
 	m3u8_dts = stream_dts = 0;
+	hls_fragment = hls_window = 0;
 	
 	audio_buffer = new SrsCodecBuffer();
 	video_buffer = new SrsCodecBuffer();
@@ -411,6 +412,23 @@ int SrsHLS::on_publish(std::string _vhost, std::string _app, std::string _stream
 	stream = _stream;
 	app = _app;
 	
+	// TODO: subscribe the reload event.
+	
+	SrsConfDirective* conf = NULL;
+	if ((conf = config->get_hls_fragment(vhost)) != NULL && !conf->arg0().empty()) {
+		hls_fragment = ::atoi(conf->arg0().c_str());
+	}
+	if (hls_fragment <= 0) {
+		hls_fragment = SRS_CONF_DEFAULT_HLS_FRAGMENT;
+	}
+	
+	if ((conf = config->get_hls_window(vhost)) != NULL && !conf->arg0().empty()) {
+		hls_window = ::atoi(conf->arg0().c_str());
+	}
+	if (hls_window <= 0) {
+		hls_window = SRS_CONF_DEFAULT_HLS_WINDOW;
+	}
+	
 	if ((ret = reopen()) != ERROR_SUCCESS) {
 		return ret;
 	}
@@ -555,9 +573,7 @@ int SrsHLS::on_video(SrsSharedPtrMessage* video)
 	// reopen the muxer for a gop
 	if (sample->frame_type == SrsCodecVideoAVCFrameKeyFrame) {
 		int64_t diff = stream_dts - m3u8_dts;
-		// 10s.
-		// TODO: config it.
-		if (diff / 90000 >= 10) {
+		if (diff / 90000 >= hls_fragment) {
 			if ((ret = reopen()) != ERROR_SUCCESS) {
 				return ret;
 			}
@@ -603,12 +619,39 @@ int SrsHLS::reopen()
 		segments.push_back(current);
 		current = NULL;
 		
+		// the segments to remove
+		std::vector<SrsM3u8Segment*> segment_to_remove;
+		
+		// shrink the segments.
+		double duration = 0;
+		std::vector<SrsM3u8Segment*>::reverse_iterator it;
+		for (it = segments.rbegin(); it != segments.rend(); ++it) {
+			SrsM3u8Segment* segment = *it;
+			duration += segment->duration;
+			
+			if ((int)duration > hls_window) {
+				segment_to_remove.push_back(segment);
+			}
+		}
+		if (!segment_to_remove.empty()) {
+			segments.erase(segments.begin(), segments.begin() + segment_to_remove.size());
+		}
+		
+		// refresh the m3u8, donot contains the removed ts
 		if ((ret = refresh_m3u8()) != ERROR_SUCCESS) {
 			return ret;
 		}
+		
+		// remove the ts file.
+		for (it = segment_to_remove.rbegin(); it != segment_to_remove.rend(); ++it) {
+			SrsM3u8Segment* segment = *it;
+			unlink(segment->full_path.c_str());
+			srs_freep(segment);
+		}
 	}
 	// new segment.
 	current = new SrsM3u8Segment();
+	current->sequence_no = file_index;
 	m3u8_dts = current->segment_start_dts = stream_dts;
 	
 	// generate filename.
diff --git a/trunk/src/core/srs_core_hls.hpp b/trunk/src/core/srs_core_hls.hpp
index aed348871..e75b7198e 100644
--- a/trunk/src/core/srs_core_hls.hpp
+++ b/trunk/src/core/srs_core_hls.hpp
@@ -74,6 +74,8 @@ private:
 	std::string stream;
 	std::string app;
 	std::string hls_path;
+	int hls_fragment;
+	int hls_window;
 private:
 	int file_index;
 	std::string m3u8;