The cooling experiment for large cryogenic parts is complex and changeable.The cooling experiment for large heat exchanger was studied in the paper.The regenerative heat exchanger was placed in a special designed cold box using liquid nitrogen as cold source and helium as coolant.The diaphragm compressor provided circulating pressure for the helium cycle.Before the experiment,9 sensors were installed on the heat exchanger and the collected date would be automatically recorded and saved in the upper computer...