Abstract: In order to solve the problem of the poor correlation of the critical radiated interference E-field strength (CRIS) test results between reverberation chambers and uniform fields, a new CRIS test method was proposed for reverberation chambers, based on the equivalence of EUT received power under different test environment. The calculation formula of the CRIS in reverberation chambers was derived, and then verified under ideal conditions by building the model of a reverberation chamber and a uniform field with the electromagnetic simulation software FEKO. An experiment was designed in reverberation chamber and the open area with the ETS 3142E antenna as equipment under test. The results show that the CRIS obtained with the new method can be well consistent with the uniform field. With the omnidirectional radiation electromagnetic environment consideration, the relative errors are greatly reduced.