In order to accurately obtain the thread execution time information of embedded real-time operating system,this paper aims at the STMicroelectronics STM32 embedded development platform,takes STM32F407 single-chip microcomputer as an examplebased on the FreeRTOS project generated by STM32CubeMX development tool to improve the thread execution time statistical measurement function and software design,and introduces and configures the time state API interface in the FreeRTOS support package,and proposes the design method of using single-chip microcomputer hardware timer to realize microsecond high-precision thread execution time measurement.The experiment results show that the software design method has high portability and can correctly output the execution time information.It can be used in embedded projects with high thread execution time requirements and STM32 series microcontroller embedded engineering design.