With the development of smart grids，the existing protection for power system terminals through physical isolation is not enough to deal with new threats. In this paper an embedded component solution with active immunity is proposed，which provides users with a complete trusted computing environment for trusted identity authentication，trusted storage，trusted metrics and trusted reporting. With the high-security national cryptography algorithm module as the root of trust，an active immune trusted computing technology solution covering secure boot，secure partition isolation，trust chain delivery mechanism and dynamic measurement mechanism is constructed. The proposed solution and the experiments prove that the solution can efficiently resist malware injection and secure boot attack.