A high precision switched current mirror circuit working in very weak current was presented.A method,which can automatically adjust the gate source voltage for mismatch compensation of the image MOSFET’ was adopted, and the compensation for the output error caused by the physical parameter mismatch could be realized.According to the design of the reconfigurable analog unit, the dual phase multiple output current mirror and mismatch compensation circuit were put forward, and an integrated design of timing and the programmable switch was also discussed.The produced error of the proposed design is less than 1% for the 20% mismatch, and the current range is 1 nA~1 μA.This circuit can be used in CMOS single poly process.Simulation results were presented to verify the theoretical design.