Abstract: In order to solve the problem that the environment E-field intensity is difficult to measure when the radiation susceptibility test is carried out in the reverberation chamber, this article analyzes the statistical characteristics of E-field intensity in reverberation chamber, theoretically derives the representation of E-fields spatial correlation function in lossy reverberation chamber, then verifies the correctness of the representation by simulation analysis. From the representation, we can draw the conclusion that in lossy reverberation chamber the E-fields at two points whose distance is greater than half-wavelength are mutually independent. Therefore in E-field intensity measurement in reverberation chamber, the distance between measurement position and EUT should be greater than 0.5, which can be taken as a selection criterion. Finally, the method of combining numerical calculation with experimental verification is adopted to analyze the relationship between relative error and relative distance, and the criteria is verified. The relative error of distribution parameter () at different relative distances is simulated and analyzed. It is concluded that the relative error can be decreased to 1.5 dB as long as the relative distance is more than 0.5, which can be applied to the actual environment E-field intensity test in reverberation chamber.