Abstract: Many structural parameters and operating parameters are involved in the design of pulse tube cryocooler regenerator， and there is a correlation between each parameter. In order to achieve the best performance of the regenerator， it is necessary to optimize every parameter， but the process will be very complicated. Based on regenerator program REGEN， the correlation of parameters in pulse tube cryocooler regenerator was researched， and the process of design and optimizing was simplified according to the correlation of parameters. This is expected to provide convenient reference for practical design of regenerators.