In order to ensure that the embedded devices of power system can startup safely and reliably,a light-weight trusted startup method based on trusted platform control module (TPCM) is designed.The COS solidified in TPCM is regarded as the trusted root of the hardware.After power on,it takes precedence of the CPU to start and the CPU resetting signal is suspended.The CPU resetting signal will be released after successfully verifying the integrity of u-boot.And it enhances the u-boot management by adding secure users,setting password protection and filtering related commands.At the same time,the integrity of the kernel is verified by using signature and encryption technology to establish a trust chain from device power on to kernel startup.Using the security and reliability of TPCM chip,this method can protect the key through hardware encryption and ensure the security and credibility of the whole startup chain.This method has been applied in some intelligent monitoring terminals of power systems.