Abstract: Cold finger is an important part of the pulse tube cryocooler whose size can affect the size of the compressor and the cryocooler.The conversion efficiency and internal loss of the cold finger also have a significant impact on the performance of the cryocooler.In order to minimize the pulse tube cryocooler,it's necessary to increase the frequency and reduce the size of the cold finger,which will have an impact on the performance of the cryocooler.To figure out how the size of the cold finger affects the performance of the cryocooler,modeling and simulation of high frequency pulse tube cryocooler was performed by SAGE software.The cryocooler was operated at 130 Hz with the cold finger diameter varies from 8 mm to 9 mm.By analyzing the results of calculation,the change rule of the performance of the high frequency pulse tube cryocooler with the size of the cold finger was obtained.The high frequency miniature pulse tube cryocooler with a diameter of 9 mm,a length of 40 mm and a pulse tube diameter of 4.3 mm had the best performance,which can provide a 0.64 W@80 K cooling capacity with 20 W electric power input.