Industrial control system is widely used in power industry, which has become the base of maintaining power system running safely and steadily. To improve the deficiency of power industry control system in power equipment information security technology, this paper introduces a design and implementation method of distribution automation remote terminal (RTU) which is based on independent intellectual property rights. Secure RTU chooses a self-control homebred chip as the core processor, an energy measurement chip is extended to improve the acquisition accuracy and simplify the design. The security mechanism based on homebred encryption algorithm allows the cryptograph transfer in the VPN channel and credentials access. Test in the laboratory shows that this method can prevent information leakage and the Trojans virus. This work is supported by National Information safety Foundation of the National Development and Reform Commission.