diff --git a/easylogger/inc/elog_cfg.h b/easylogger/inc/elog_cfg.h
index 91faf67..16548bf 100644
--- a/easylogger/inc/elog_cfg.h
+++ b/easylogger/inc/elog_cfg.h
@@ -73,5 +73,8 @@
 #define ELOG_BUF_OUTPUT_ENABLE
 /* buffer size for buffered output mode */
 #define ELOG_BUF_OUTPUT_BUF_SIZE                 (ELOG_LINE_BUF_SIZE * 10)
+/*---------------------------------------------------------------------------*/
+/* enable use elog in isr context */
+// #define ELOG_USING_ISR_LOG
 
 #endif /* _ELOG_CFG_H_ */
diff --git a/easylogger/port/elog_port.c b/easylogger/port/elog_port.c
index 4b5409c..aea589b 100644
--- a/easylogger/port/elog_port.c
+++ b/easylogger/port/elog_port.c
@@ -25,7 +25,7 @@
  * Function: Portable interface for each platform.
  * Created on: 2015-04-28
  */
- 
+
 #include <elog.h>
 
 /**
@@ -37,7 +37,7 @@ ElogErrCode elog_port_init(void) {
     ElogErrCode result = ELOG_NO_ERR;
 
     /* add your code here */
-    
+
     return result;
 }
 
@@ -58,27 +58,58 @@ void elog_port_deinit(void) {
  * @param size log size
  */
 void elog_port_output(const char *log, size_t size) {
-    
+
+    /* add your code here */
+
+}
+
+/**
+ *  interrupt get nest level
+ */
+void elog_port_interrupt_get_nest(void) {
+
+    /* add your code here */
+
+}
+
+#ifdef ELOG_USING_ISR_LOG
+
+/**
+ * output lock in isr context
+ */
+void elog_port_output_lock_isr(void) {
+
+    /* add your code here */
+
+}
+
+/**
+ * output unlock in isr context
+ */
+void elog_port_output_unlock_isr(void) {
+
     /* add your code here */
-    
+
 }
 
+#endif
+
 /**
  * output lock
  */
 void elog_port_output_lock(void) {
-    
+
     /* add your code here */
-    
+
 }
 
 /**
  * output unlock
  */
 void elog_port_output_unlock(void) {
-    
+
     /* add your code here */
-    
+
 }
 
 /**
@@ -87,9 +118,9 @@ void elog_port_output_unlock(void) {
  * @return current time
  */
 const char *elog_port_get_time(void) {
-    
+
     /* add your code here */
-    
+
 }
 
 /**
@@ -98,9 +129,9 @@ const char *elog_port_get_time(void) {
  * @return current process name
  */
 const char *elog_port_get_p_info(void) {
-    
+
     /* add your code here */
-    
+
 }
 
 /**
@@ -109,7 +140,7 @@ const char *elog_port_get_p_info(void) {
  * @return current thread name
  */
 const char *elog_port_get_t_info(void) {
-    
+
     /* add your code here */
-    
-}
\ No newline at end of file
+
+}
diff --git a/easylogger/src/elog.c b/easylogger/src/elog.c
index 421a110..ba31463 100644
--- a/easylogger/src/elog.c
+++ b/easylogger/src/elog.c
@@ -117,7 +117,10 @@
 /* EasyLogger object */
 static EasyLogger elog;
 /* every line log's buffer */
-static char log_buf[ELOG_LINE_BUF_SIZE] = { 0 };
+static char thread_log_buf[ELOG_LINE_BUF_SIZE] = { 0 };
+#ifdef ELOG_USING_ISR_LOG
+static char isr_log_buf[ELOG_LINE_BUF_SIZE] = { 0 };
+#endif
 /* level output info */
 static const char *level_output_info[] = {
         [ELOG_LVL_ASSERT]  = "A/",
@@ -147,9 +150,29 @@ static void elog_set_filter_tag_lvl_default(void);
 void (*elog_assert_hook)(const char* expr, const char* func, size_t line);
 
 extern void elog_port_output(const char *log, size_t size);
+extern int elog_port_interrupt_get_nest(void);
+
+#ifdef ELOG_USING_ISR_LOG
+extern void elog_port_output_lock_isr(void);
+extern void elog_port_output_unlock_isr(void);
+#endif
+
 extern void elog_port_output_lock(void);
 extern void elog_port_output_unlock(void);
 
+static char *get_log_buf(void)
+{
+    if (elog_port_interrupt_get_nest() == 0) {
+        return thread_log_buf;
+    } else {
+#ifdef ELOG_USING_ISR_LOG
+        return isr_log_buf;
+#else
+        return NULL;
+#endif
+    }
+}
+
 /**
  * EasyLogger initialize.
  *
@@ -211,7 +234,7 @@ void elog_deinit(void) {
     if (!elog.init_ok) {
         return ;
     }
-    
+
 #ifdef ELOG_ASYNC_OUTPUT_ENABLE
     elog_async_deinit();
 #endif
@@ -230,7 +253,7 @@ void elog_start(void) {
     if (!elog.init_ok) {
         return ;
     }
-    
+
     /* enable output */
     elog_set_output_enabled(true);
 
@@ -280,7 +303,7 @@ void elog_set_output_enabled(bool enabled) {
 #ifdef ELOG_COLOR_ENABLE
 /**
  * set log text color enable or disable
- * 
+ *
  * @param enabled TRUE: enable FALSE:disable
  */
 void elog_set_text_color_enabled(bool enabled) {
@@ -365,14 +388,21 @@ void elog_set_filter_kw(const char *keyword) {
 }
 
 /**
- * lock output 
+ * lock output
  */
 void elog_output_lock(void) {
-    if (elog.output_lock_enabled) {
-        elog_port_output_lock();
-        elog.output_is_locked_before_disable = true;
+    if(elog_port_interrupt_get_nest() == 0) {
+        if (elog.output_lock_enabled) {
+            elog_port_output_lock();
+            elog.output_is_locked_before_disable = true;
+        } else {
+            elog.output_is_locked_before_enable = true;
+        }
     } else {
-        elog.output_is_locked_before_enable = true;
+#ifdef ELOG_USING_ISR_LOG
+        if (elog.output_lock_enabled)
+            elog_port_output_lock_isr();
+#endif
     }
 }
 
@@ -380,11 +410,18 @@ void elog_output_lock(void) {
  * unlock output
  */
 void elog_output_unlock(void) {
-    if (elog.output_lock_enabled) {
-        elog_port_output_unlock();
-        elog.output_is_locked_before_disable = false;
+    if(elog_port_interrupt_get_nest() == 0) {
+        if (elog.output_lock_enabled) {
+            elog_port_output_unlock();
+            elog.output_is_locked_before_disable = false;
+        } else {
+            elog.output_is_locked_before_enable = false;
+        }
     } else {
-        elog.output_is_locked_before_enable = false;
+#ifdef ELOG_USING_ISR_LOG
+        if (elog.output_lock_enabled)
+            elog_port_output_unlock_isr();
+#endif
     }
 }
 
@@ -506,6 +543,7 @@ uint8_t elog_get_filter_tag_lvl(const char *tag)
 void elog_raw_output(const char *format, ...) {
     va_list args;
     size_t log_len = 0;
+    char *log_buf = NULL;
     int fmt_result;
 
     /* check output enabled */
@@ -513,6 +551,11 @@ void elog_raw_output(const char *format, ...) {
         return;
     }
 
+    log_buf = get_log_buf();
+    if (log_buf == NULL) {
+        return;
+    }
+
     /* args point to the first variable parameter */
     va_start(args, format);
 
@@ -563,6 +606,7 @@ void elog_output(uint8_t level, const char *tag, const char *file, const char *f
     extern const char *elog_port_get_p_info(void);
     extern const char *elog_port_get_t_info(void);
 
+    char *log_buf = NULL;
     size_t tag_len = strlen(tag), log_len = 0, newline_len = strlen(ELOG_NEWLINE_SIGN);
     char line_num[ELOG_LINE_NUM_MAX_LEN + 1] = { 0 };
     char tag_sapce[ELOG_FILTER_TAG_MAX_LEN / 2 + 1] = { 0 };
@@ -581,6 +625,12 @@ void elog_output(uint8_t level, const char *tag, const char *file, const char *f
     } else if (!strstr(tag, elog.filter.tag)) { /* tag filter */
         return;
     }
+
+    log_buf = get_log_buf();
+    if (log_buf == NULL) {
+        return;
+    }
+
     /* args point to the first variable parameter */
     va_start(args, format);
     /* lock output */
@@ -654,7 +704,7 @@ void elog_output(uint8_t level, const char *tag, const char *file, const char *f
         /* package func info */
         if (get_fmt_enabled(level, ELOG_FMT_FUNC)) {
             log_len += elog_strcpy(log_len, log_buf + log_len, func);
-            
+
         }
         log_len += elog_strcpy(log_len, log_buf + log_len, ")");
     }
@@ -856,6 +906,7 @@ void elog_hexdump(const char *name, uint8_t width, const void *buf, uint16_t siz
 
     uint16_t i, j;
     uint16_t log_len = 0;
+    char *log_buf = NULL;
     const uint8_t *buf_p = buf;
     char dump_string[8] = {0};
     int fmt_result;
@@ -871,6 +922,11 @@ void elog_hexdump(const char *name, uint8_t width, const void *buf, uint16_t siz
         return;
     }
 
+    log_buf = get_log_buf();
+    if (log_buf == NULL) {
+        return;
+    }
+
     /* lock output */
     elog_output_lock();