Abstract: Upgrading space cryocooler temperature controlling precision is very important to space cryocooler work stability. By emulate analysis,this paper obtain that in different white noise intensity,a optimal value is existed between the noise intensity and the oversampling frequency,when use oversampling method to obtain a better resolution. Under the premise of the white noise intensity fixed,taking into account the execution efficiency and execution time of the software, the AD acquisition resolution can be improved significantly by properly increasing the sampling times. So the high resolution AD data is input to the temperature data can get a higher accuracy of temperature control.