Large power microwave nonlinear effects on amplitude-phase controller chip were experimentally test. ed and theoretical analyzed. This chip had the typical application on Ka-band phased array radar(PAR)transmit/receive(T/R)modules. The test platform was built up by a solid source and a pulsed magnetron to generate large power Ka-band microwave. The degradation and destroy phenomenon were observed distinctly as the input power amplitudes were improved. The total-state phase characteristics and the degradation thresholds of the selected chiped are obtained through a series of experimental tests. At last,the results are given by figures and the damage mecha. nism is theoretically analyzed.of China(61571078,61801088,11505043)and the National Key R&D Program of China(2017YFE0300200,2017YFE0300201).