Abstract: To meet the complicated require for space thermal environment test of space optical remote sensor,the ZM4300 space environment test facility employed some innovation technique,which including multiple test mode,composite contamination controlling technology,single channel-double current heat sink,both liquid nitrogen and alcohol（mechanicalref rigeration） cooling method,unload vibration isolation device and multiple liquid nitrogen running mode,etc.The testresults had demonstrated that the ZM4300 space environ ment test facility can fulfil all of tasks in the space environmenttest for space optical remote sensor,The performance index of space environment test facility have reached to leading level in our country.