With the development in information levels of wars,the complex electromagnetic environment adaptability is more and more important for radar equipments. Through the analysis on the electromagnetic environments in which radar equipments work,the compositions of the electromagnetic environments for radar equipments are determined. The performance metrics susceptible to the external environments are studied. On basis of the definition of the complex electromagnetic environment adaptability of radar equipments,the requirements of test environments, test items and test equipments for radar equipments adaptive tests are presented. The work can provide reference for the implementation of adaptive tests of radar equipments.