Abstract: The climate change of blocking high are investigated using thedaily 500 hPa historical synoptic charts from 1965 to 1990. It is found that there are two blocking high active regions in Northern Hemisphere. The number of blocking high had a decrease trend form 1965 to 1990. The frequency of blocking high decreased some that when the hemispheric temperature was higher than the normal, and that of blocking high increased in the cold year. The regional distribution of blocking high for the two typical years has an obviously inverse relationship. There was a large negative anomaly center at the Ural mountains for ENSO year. The inverse distribution of blocking high had been found in the drought years and flood years of Inner Mongolia Autonomous Region. The same relationship was discoverd for Changjiang River and Huaihe Valley.