Making objective prediction of temperature and precipitation with numerical weather prediction products,a common method is used in smoothing the numerical weather prediction product factors so as to filtrate noise.To compare smoothing factors with non smoothing ones,MOS forecast equations about daily extreme temperature and rainfall in 1—5 days at various Shandong weather stations were set up,with the two methods respectively and the use of T106 numerical weather prediction product data of during Jun.—Sep.from 1995 to 1997.The two prediction results during Jul.—Sep.in 1999 were tested.It shows that forecast effect of non smoothness management is superior to that of the smoothness management.