diff --git a/src/sf_global.c b/src/sf_global.c
index 9cc450a..e97cc71 100644
--- a/src/sf_global.c
+++ b/src/sf_global.c
@@ -188,6 +188,35 @@ int sf_load_log_config(IniFullContext *ini_ctx, LogContext *log_ctx,
     return 0;
 }
 
+int sf_load_slow_log_config_ex(IniFullContext *ini_ctx, LogContext *log_ctx,
+        SFSlowLogConfig *slow_log_cfg)
+{
+    int result;
+    char *filename_prefix;
+
+    if ((result=sf_load_log_config(ini_ctx, log_ctx,
+                    &slow_log_cfg->log_cfg)) != 0)
+    {
+        return result;
+    }
+
+    slow_log_cfg->enabled = iniGetBoolValue(ini_ctx->section_name,
+            "enabled", ini_ctx->context, false);
+    slow_log_cfg->log_slower_than_ms = iniGetIntValue(ini_ctx->section_name,
+            "log_slower_than_ms", ini_ctx->context, 100);
+    filename_prefix = iniGetStrValue(ini_ctx->section_name,
+            "filename_prefix", ini_ctx->context);
+    if (filename_prefix == NULL || *filename_prefix == '\0') {
+        strcpy(slow_log_cfg->filename_prefix, "slow");
+    } else {
+        snprintf(slow_log_cfg->filename_prefix,
+                sizeof(slow_log_cfg->filename_prefix),
+                "%s", filename_prefix);
+    }
+
+    return 0;
+}
+
 int sf_load_global_config_ex(const char *server_name,
         IniFullContext *ini_ctx, const bool load_network_params,
         const int task_buffer_extra_size)
@@ -437,14 +466,16 @@ void sf_context_config_to_string(const SFContext *sf_context,
             sf_context->accept_threads, sf_context->work_threads);
 }
 
-void sf_log_config_to_string(SFLogConfig *log_cfg,
-        const char *caption, char *output, const int size)
+void sf_log_config_to_string_ex(SFLogConfig *log_cfg, const char *caption,
+        const char *other_config, char *output, const int size)
 {
     snprintf(output, size,
-            "%s: {sync_log_buff_interval=%d, rotate_everyday=%d, "
+            "%s: {%s%ssync_log_buff_interval=%d, rotate_everyday=%d, "
             "rotate_time=%02d:%02d, rotate_on_size=%"PRId64", "
             "compress_old=%d, compress_days_before=%d, keep_days=%d, "
             "delete_old_time=%02d:%02d}", caption,
+            other_config != NULL ? other_config : "",
+            other_config != NULL ? ", " : "",
             log_cfg->sync_log_buff_interval, log_cfg->rotate_everyday,
             log_cfg->rotate_time.hour, log_cfg->rotate_time.minute,
             log_cfg->rotate_on_size, log_cfg->compress_old,
@@ -452,6 +483,29 @@ void sf_log_config_to_string(SFLogConfig *log_cfg,
             log_cfg->delete_old_time.hour, log_cfg->delete_old_time.minute);
 }
 
+void sf_slow_log_config_to_string(SFSlowLogConfig *slow_log_cfg,
+        const char *caption, char *output, const int size)
+{
+    int len;
+    char slow_log_buff[256];
+
+    len = snprintf(slow_log_buff, sizeof(slow_log_buff),
+            "enabled=%d", slow_log_cfg->enabled);
+    if (!slow_log_cfg->enabled) {
+        snprintf(output, size, "%s: {%s}",
+                caption, slow_log_buff);
+        return;
+    }
+
+    snprintf(slow_log_buff + len, sizeof(slow_log_buff) - len,
+            ", filename_prefix=%s, log_slower_than_ms=%d",
+            slow_log_cfg->filename_prefix,
+            slow_log_cfg->log_slower_than_ms);
+
+    sf_log_config_to_string_ex(&slow_log_cfg->log_cfg, caption,
+            slow_log_buff, output, size);
+}
+
 void sf_global_config_to_string(char *output, const int size)
 {
     int len;
@@ -483,7 +537,7 @@ void sf_global_config_to_string(char *output, const int size)
                 );
 
     sf_log_config_to_string(&g_sf_global_vars.error_log,
-            "error_log_file", output + len, size - len);
+            "error_log", output + len, size - len);
 }
 
 void sf_log_config_ex(const char *other_config)
diff --git a/src/sf_global.h b/src/sf_global.h
index fd3724b..ee7ebbc 100644
--- a/src/sf_global.h
+++ b/src/sf_global.h
@@ -157,9 +157,28 @@ static inline int sf_load_context_from_config(SFContext *sf_context,
     return sf_load_context_from_config_ex(sf_context, &config);
 }
 
+int sf_load_log_config(IniFullContext *ini_ctx, LogContext *log_ctx,
+        SFLogConfig *log_cfg);
+
+int sf_load_slow_log_config_ex(IniFullContext *ini_ctx, LogContext *log_ctx,
+        SFSlowLogConfig *slow_log_cfg);
+
+static inline int sf_load_slow_log_config(const char *config_file,
+        IniContext *ini_context, LogContext *log_ctx,
+        SFSlowLogConfig *slow_log_cfg)
+{
+    IniFullContext ini_ctx;
+
+    FAST_INI_SET_FULL_CTX_EX(ini_ctx, config_file, "slow_log", ini_context);
+    return sf_load_slow_log_config_ex(&ini_ctx, log_ctx, slow_log_cfg);
+}
+
 void sf_set_log_rotate_size(LogContext *context, const int64_t log_rotate_size);
 
-void sf_log_config_to_string(SFLogConfig *log_cfg,
+void sf_log_config_to_string_ex(SFLogConfig *log_cfg, const char *caption,
+        const char *other_config, char *output, const int size);
+
+void sf_slow_log_config_to_string(SFSlowLogConfig *slow_log_cfg,
         const char *caption, char *output, const int size);
 
 void sf_global_config_to_string(char *output, const int size);
@@ -171,6 +190,9 @@ void sf_log_config_ex(const char *other_config);
 
 #define sf_log_config() sf_log_config_ex(NULL)
 
+#define sf_log_config_to_string(log_cfg, caption, output, size)  \
+    sf_log_config_to_string_ex(log_cfg, caption, NULL, output, size)
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/sf_service.c b/src/sf_service.c
index b02eefc..a525323 100644
--- a/src/sf_service.c
+++ b/src/sf_service.c
@@ -600,12 +600,12 @@ int sf_setup_signal_handler()
     return 0;
 }
 
+#define LOG_SCHEDULE_ENTRIES_COUNT 3
+
 int sf_startup_schedule(pthread_t *schedule_tid)
 {
-#define SCHEDULE_ENTRIES_COUNT 3
-
     ScheduleArray scheduleArray;
-    ScheduleEntry scheduleEntries[SCHEDULE_ENTRIES_COUNT];
+    ScheduleEntry scheduleEntries[LOG_SCHEDULE_ENTRIES_COUNT];
 
     scheduleArray.entries = scheduleEntries;
     sf_setup_schedule(&g_log_context, &g_sf_global_vars.error_log,
@@ -615,6 +615,28 @@ int sf_startup_schedule(pthread_t *schedule_tid)
             &g_sf_global_vars.continue_flag);
 }
 
+int sf_add_slow_log_schedule(LogContext *pContext,
+        SFSlowLogConfig *slow_log_cfg)
+{
+    int result;
+    ScheduleArray scheduleArray;
+    ScheduleEntry scheduleEntries[LOG_SCHEDULE_ENTRIES_COUNT];
+
+    if (!slow_log_cfg->enabled) {
+        return 0;
+    }
+
+    if ((result=sf_logger_init(pContext, slow_log_cfg->
+                    filename_prefix)) != 0)
+    {
+        return result;
+    }
+
+    scheduleArray.entries = scheduleEntries;
+    sf_setup_schedule(pContext, &slow_log_cfg->log_cfg, &scheduleArray);
+    return sched_add_entries(&scheduleArray);
+}
+
 void sf_set_current_time()
 {
     g_current_time = time(NULL);
diff --git a/src/sf_service.h b/src/sf_service.h
index faf91b9..ad497d2 100644
--- a/src/sf_service.h
+++ b/src/sf_service.h
@@ -67,7 +67,11 @@ int sf_service_destroy_ex(SFContext *sf_context);
 #define sf_service_destroy() sf_service_destroy_ex(&g_sf_context)
 
 int sf_setup_signal_handler();
+
 int sf_startup_schedule(pthread_t *schedule_tid);
+int sf_add_slow_log_schedule(LogContext *pContext,
+        SFSlowLogConfig *slow_log_cfg);
+
 void sf_set_current_time();
 
 int sf_socket_server_ex(SFContext *sf_context);
diff --git a/src/sf_types.h b/src/sf_types.h
index 6d77112..8999572 100644
--- a/src/sf_types.h
+++ b/src/sf_types.h
@@ -118,4 +118,16 @@ typedef struct sf_log_config {
     int64_t rotate_on_size;
 } SFLogConfig;
 
+typedef struct sf_slow_log_config {
+    bool enabled;
+    int log_slower_than_ms;
+    char filename_prefix[64];
+    SFLogConfig log_cfg;
+} SFSlowLogConfig;
+
+typedef struct sf_slow_log_context {
+    SFSlowLogConfig cfg;
+    LogContext ctx;
+} SFSlowLogContext;
+
 #endif
diff --git a/src/sf_util.c b/src/sf_util.c
index 04648a5..9c71efd 100644
--- a/src/sf_util.c
+++ b/src/sf_util.c
@@ -151,14 +151,16 @@ ScheduleEntry *sf_logger_set_schedule_entry(struct log_context *pContext,
         INIT_SCHEDULE_ENTRY_EX(*pScheduleEntry, sched_generate_next_id(),
                 log_cfg->rotate_time, 86400, log_notify_rotate, pContext);
         pScheduleEntry++;
+    }
 
-        if (log_cfg->keep_days > 0) {
-            log_set_keep_days(pContext, log_cfg->keep_days);
-            INIT_SCHEDULE_ENTRY_EX(*pScheduleEntry, sched_generate_next_id(),
-                    log_cfg->delete_old_time, 86400, log_delete_old_files,
-                    pContext);
-            pScheduleEntry++;
-        }
+    if ((log_cfg->rotate_everyday || log_cfg->rotate_on_size > 0) &&
+            (log_cfg->keep_days > 0))
+    {
+        log_set_keep_days(pContext, log_cfg->keep_days);
+        INIT_SCHEDULE_ENTRY_EX(*pScheduleEntry, sched_generate_next_id(),
+                log_cfg->delete_old_time, 86400, log_delete_old_files,
+                pContext);
+        pScheduleEntry++;
     }
 
     return pScheduleEntry;