The direct current transformer based on GMR effect is applied in measuring current output lines, which can meet the current requirements of high-current measurement. Nowadays, in measurement system, cable or optical fiber is mainly used in signal transmission system. However, in some areas because of some condition limitation, they can not satisfy with the practical needs. To solve this question, a new method is introduced in the paper, which utilizes wireless transmission in measure system.This paper focuses on designing the signal processing circuit, mainly analyses the hardware and software. In hardware circuit, signal processing circuit on high voltage and converter controlled by MCU, wireless transmission circuit and date circuit on low voltage is designed. In order that transmission signals are more accurate and reliable, wireless transceiver module is adopted, together with encoder and decoder. The design of software is mainly programmed by C language. During the design, performance of various circuit is made a simulation analysis, also data collection and transmission circuit together with data receiving and processing circuit is built. Actual debugging shows that data signal can be displayed exactly and reliably on low voltage. A /D

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