Based on the data of sunshine, cloud amount, haze, fog, sand dust, fro m 1954 to 2005, at Dezhou, Shandong Province, the climate tendency is calculated with the least square method. The result indicated that, the Dezhou sunshine du ration reduced by 105.0 hours per 10 years, the sunshine percentage reduced by 2 .4% per 10 years. Total cloud amount reduced by 0.03 tenth per 10 years. The san dstorm, blowing sand, and floating dust day numbers assume the obviously reduced tendency. Low cloud amount and haze, mist, foggy days appeared to have an incre ase tendency, in particular, from the late 1990s an obvious increase, correspond ing to the economical scale fast growth from the mid 1990s. It has explained tha t the sunshine decrease is mainly because the low cloud amount increases and the human activity enhances, specially, the atmospheric aerosol due to the industri al emission suddenly increases.