Abstract: There exist phase sudden change of the output laser wave surface between the annular area and the shelter central area in normal type unstable resonators. It would lead to the laser energy divergence seriously in the far field. Specially, the intensity of central disk of far field will then be reduced. We have given it's theory analysis in detailed in ref［１］. This paper we emphasize in experimental research of this type of laser resonators with homogenized phase. On the situation of cavity rence transparent radio in laser light from central area have been chosen. All of the experiments are working in a copper vapor laser system with a large aperture. Good agreement results with the theory analysis have obtained. Specially, reducing the farfield divergence angles in 34% as the transpar