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The decoding of dual channel resolver is always a very important problem in the servo control closed-loop system. Fast and accurate decoding of servo system position information is the key to the closed-loop control system. Through the research on the position decoding technology of a closed-loop control system of a servo system, the decoding process and principle of RD26 are analyzed, and a dual channel resolver position decoding device based on RD26 is designed. This device connects the signal output by the dual channel resolver with RD26, sends data to FPGA through the parallel port, and FPGA reads the RD26 signal through the time sequence, which can translate the dual channel resolver into a rough machine The analog voltage signal of the fine machine is converted into a digital signal with absolute position. No error correction and coarse fine combination are required, and the decoding accuracy can reach ± 2 minutes+1 LSB.