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In the remote sensing camera, the focusing surface component is required for high-precision refrigeration control to ensure high-quality imaging, so the focal plane high precision refrigeration control strategy is designed based on model identification. The refrigeration system designs a specific two-stage amplification mechanism on the hardware to obtain high-precision temperature data, and realizes the optimization of digital incremental PID control algorithm to obtain high-precision temperature control effect. This system adopts pulse tube refrigerator as the control object, combines the relay feedback identification method with a high-order model, obtains the process model of the refrigeration control system using least squares. The establishment of the model ensures the accuracy of the control algorithm parameters and the accuracy of temperature control. This method reduces the time cost and improves temperature control accuracy which is much smarter than the traditional method of adjusting parameters. The experimental results show that a high-precision and high-stability refrigeration control is achieved because the temperature control accuracy of the system is ±27mk and it stabilizes within 6 minutes after being disturbed.