Abstract: Firstly, this paper discusses the conception of the envimnmental test Validity and the differences of Validity criterion among different envimnmemal tests. Secondly, various factors which affbct me validity of laboratory environmental tests, especially those related with management, are analyzed. Finally, it is suggested that strict care be paid to tlle drawing-up and evaluation of the environmental test scheme, me test process monitoring aIld the rcquirements for me enVironmental evaluation test report.