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For the traditional valve locator has much disadvantage in the industrial control system, such as poor stability and anti-interference ability, low precision and degree of intelligence, and the deficiency of independent research and development production of our country about the high precision valve locator. This paper designs a low power intelligent positioning value control system, with ARM Cortex-M3 as the core controller. The control algorithm uses the optimized PID, and Self-tuning PID parameters which adopt Ziegler-Nichols law in the design. With two-wire system HART protocol implementation to communicate with the external device. Practice shows that the self-tuning of PID parameters can better adapt to all kinds of control field, that make the system run fast ,stable and realizes the precise localization of valve position and the essential requirements of safety ,low power design.