We present a practical RSS (Root Security System) which not only conforms to HW RoT security requirement in RISC-V Server SoC and Platform Specification but also could be integrated into Server and AI SoC as HW RoT to offer security services applicable to system security service and user application. Beside already defined security rules to HW RoT, we found RSS also requires new function to enhance system security and support server Reliability, Availabitliy and Servicable. we present new 4 security rules proposal to HW RoT according to new function. Finally, we discuss an effective solution for RSS to security compliance certification as TOE.