diff --git a/components/Kconfig b/components/Kconfig
index d9b9bc60df..5aee4360a0 100644
--- a/components/Kconfig
+++ b/components/Kconfig
@@ -34,5 +34,6 @@ source "$RTT_DIR/components/libc/Kconfig"
 source "$RTT_DIR/components/net/Kconfig"
 source "$RTT_DIR/components/utilities/Kconfig"
 source "$RTT_DIR/components/vbus/Kconfig"
+source "$RTT_DIR/components/ktime/Kconfig"
 
 endmenu
diff --git a/components/drivers/rtc/soft_rtc.c b/components/drivers/rtc/soft_rtc.c
index 3d84e547ad..ec74b7e372 100644
--- a/components/drivers/rtc/soft_rtc.c
+++ b/components/drivers/rtc/soft_rtc.c
@@ -13,7 +13,9 @@
 #include <rtthread.h>
 #include <rtdevice.h>
 
+#ifdef RT_USING_KTIME
 #include <ktime.h>
+#endif
 
 #ifdef RT_USING_SOFT_RTC
 
@@ -38,8 +40,11 @@ static rt_device_t    source_device = RT_NULL;
 static struct rt_device soft_rtc_dev;
 static rt_tick_t init_tick;
 static time_t init_time;
+
+#ifdef RT_USING_KTIME
 static struct timeval   init_tv = {0};
 static struct timespec  init_ts = {0};
+#endif
 
 #ifdef RT_USING_ALARM
 
@@ -92,10 +97,12 @@ static void _source_device_control(int cmd, void *args)
 static rt_err_t soft_rtc_control(rt_device_t dev, int cmd, void *args)
 {
     time_t *t;
+#ifdef RT_USING_KTIME
     struct timeval  *tv;
     struct timespec *ts;
     struct timeval   _tv;
     struct timespec  _ts;
+#endif
     struct tm time_temp;
 
     RT_ASSERT(dev != RT_NULL);
@@ -123,6 +130,7 @@ static rt_err_t soft_rtc_control(rt_device_t dev, int cmd, void *args)
         soft_rtc_alarm_update(&wkalarm);
         break;
 #endif
+#ifdef RT_USING_KTIME
     case RT_DEVICE_CTRL_RTC_GET_TIMEVAL:
         tv = (struct timeval *)args;
         rt_ktime_boottime_get_us(&_tv);
@@ -154,6 +162,9 @@ static rt_err_t soft_rtc_control(rt_device_t dev, int cmd, void *args)
         ts->tv_sec  = 0;
         ts->tv_nsec = (rt_ktime_cputimer_getres() / RT_KTIME_RESMUL);
         break;
+#endif
+    default:
+        return -RT_EINVAL;
     }
 
     return RT_EOK;
diff --git a/components/ktime/Kconfig b/components/ktime/Kconfig
new file mode 100644
index 0000000000..170271c222
--- /dev/null
+++ b/components/ktime/Kconfig
@@ -0,0 +1,3 @@
+menuconfig RT_USING_KTIME
+    bool "Ktime: kernel time"
+    default n
diff --git a/components/ktime/SConscript b/components/ktime/SConscript
index 0ec9655697..6eedb84818 100644
--- a/components/ktime/SConscript
+++ b/components/ktime/SConscript
@@ -14,6 +14,6 @@ if rtconfig.ARCH in list:
         src += Glob("src/" + rtconfig.ARCH + "/*.c")
 CPPPATH = [cwd, cwd + "/inc"]
 
-group = DefineGroup('ktime', src, depend=[''], CPPPATH=CPPPATH)
+group = DefineGroup('ktime', src, depend=['RT_USING_KTIME'], CPPPATH=CPPPATH)
 
 Return('group')
diff --git a/components/libc/compilers/common/ctime.c b/components/libc/compilers/common/ctime.c
index 4f3e424f68..bec2d24b4f 100644
--- a/components/libc/compilers/common/ctime.c
+++ b/components/libc/compilers/common/ctime.c
@@ -25,7 +25,6 @@
  */
 
 #include "sys/time.h"
-#include <ktime.h>
 #include <rthw.h>
 #include <rtthread.h>
 #include <sys/errno.h>
@@ -40,6 +39,9 @@
 #if defined( RT_USING_RTC ) || defined( RT_USING_CPUTIME)
 #include <rtdevice.h>
 #endif
+#ifdef RT_USING_KTIME
+#include "ktime.h"
+#endif
 
 #define DBG_TAG    "time"
 #define DBG_LVL    DBG_INFO
@@ -459,7 +461,7 @@ int settimeofday(const struct timeval *tv, const struct timezone *tz)
 }
 RTM_EXPORT(settimeofday);
 
-#ifdef RT_USING_POSIX_DELAY
+#if defined(RT_USING_POSIX_DELAY) && defined(RT_USING_KTIME)
 int nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
 {
     struct timespec old_ts = {0};
@@ -501,9 +503,9 @@ int nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
     return 0;
 }
 RTM_EXPORT(nanosleep);
-#endif /* RT_USING_POSIX_DELAY */
+#endif /* RT_USING_POSIX_DELAY && RT_USING_KTIME */
 
-#ifdef RT_USING_POSIX_CLOCK
+#if defined(RT_USING_POSIX_CLOCK) && defined(RT_USING_KTIME)
 
 int clock_getres(clockid_t clockid, struct timespec *res)
 {
@@ -693,9 +695,9 @@ int rt_timespec_to_tick(const struct timespec *time)
 }
 RTM_EXPORT(rt_timespec_to_tick);
 
-#endif /* RT_USING_POSIX_CLOCK */
+#endif /* RT_USING_POSIX_CLOCK && RT_USING_KTIME */
 
-#ifdef RT_USING_POSIX_TIMER
+#if defined(RT_USING_POSIX_TIMER) && defined(RT_USING_KTIME)
 
 #include <resource_id.h>
 
@@ -1111,7 +1113,7 @@ int timer_settime(timer_t timerid, int flags, const struct itimerspec *value,
     return 0;
 }
 RTM_EXPORT(timer_settime);
-#endif /* RT_USING_POSIX_TIMER */
+#endif /* RT_USING_POSIX_TIMER && RT_USING_KTIME */
 
 
 /* timezone */
diff --git a/components/libc/posix/Kconfig b/components/libc/posix/Kconfig
index 148014407a..f8c929b45c 100644
--- a/components/libc/posix/Kconfig
+++ b/components/libc/posix/Kconfig
@@ -47,6 +47,7 @@ if RT_USING_POSIX_FS
 endif
 
 config RT_USING_POSIX_DELAY
+    select RT_USING_KTIME
     bool "Enable delay APIs, sleep()/usleep()/msleep() etc"
     default n
 
@@ -56,7 +57,7 @@ config RT_USING_POSIX_CLOCK
     default n
 
 config RT_USING_POSIX_TIMER
-    select RT_USING_TIMER_SOFT
+    select RT_USING_KTIME
     select RT_USING_RESOURCE_ID
     bool "Enable timer APIs, timer_create()/timer_gettime() etc"
     default n
diff --git a/src/Kconfig b/src/Kconfig
index ed280c0020..b869559952 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -34,6 +34,7 @@ config RT_USING_SMART
     select RT_USING_POSIX_CLOCK
     select RT_USING_POSIX_FS
     select RT_USING_POSIX_TERMIOS
+    select RT_USING_KTIME
     depends on ARCH_ARM_CORTEX_M || ARCH_ARM_ARM9 || ARCH_ARM_CORTEX_A || ARCH_ARMV8 || ARCH_RISCV64
     help
         RT-Thread Smart is a microkernel based operating system on RT-Thread.