This paper investigates the several verification techniques and their skills cores about probability of precipitation(POP),and presents a new reliability index which will be adapted to Chinese POP operation in accordance with the forecast probability and observed frequencys distribution curve.Verification results show that the POP forecasts in Beijing in 1995 are reliable and skillful for light rain,but lesser reliable for 24-36h forecasts of moderate rain .However,the analysis suggests that the skill scores would be biased in the place wherein the climatic frequency of precipitation is low.