In accordance with the shortage on the application of the traditional calibration Solution of environmental test equipment, this paper proposes a solution of flexible field calibration , which can be applicable to all sorts of environmental test equipments widely. The frame of system hardware and software is presented firstly through the system requirement analysis, then the key matter - - flexible calibration is analyzed and expatiated more deeply. Through actual test , it is shown that the solution put forward in this paper have notable applied values and spread significances.