In the paper,a trusted startup implementation method is proposed which is based on the domestic operating system RT-Thread and the domestic development board AB32VG1.Starting from the direction of establishing trusted entity and integrity measurement,the trusted boot framework divides the U-boot into two parts to form a trusted entity together with the core file of the operating system,and sends it to the trusted encryption module for integrity measurement.If the measurement is successful,the control signal is returned to the external device,and the trusted entity is saved in the nonvolatile memory.Otherwise,startup is prohibited.As the trusted root of the system,the trusted encryption module is completed through SM4 and SM3 double encryption.Through verification on the AB32VG1 development board,the control signal can be correctly output,the system operates stably and starts safely,the encryption results are correct for many times,and the integrity measurement can be completed quickly,which is consistent with the expected design goal.