Experimental study on plasma radiation characteristics of W wire array Z pinch with different initial parameters performed on Qiangguang-Ⅰ pulsed power generator of 1.4—2.1MA current with 80—100ns rise time is reported. The generator configuration and the diagnostic system for the experiments are briefly described. The total X-ray energy and peak power have been measured, and the maximum of X-ray energy and peak power are 34kJ and 1.28TW，respectively. In additional, the main results and conclusions are discussed also.