Abstract: Increasing the thermal resistance can suppress the temperature fluctuation at the cold head of the cryocooler.In order to quantify the relationship between thermal resistance and cold head temperature fluctuation transfer effect,a temperature control test platform was built based on G-M cryocooler.By changing the specification and installation mode of the thermal damper,the temperature fluctuation of the cold head and the target copper block was measured at high frequency.The quantitative fitting relationship between the suppression effect of the temperature fluctuation and the thickness of the thermal damper was obtained.The suggestion for quantization suppression of cold head fluctuation are given.