Abstract: In order to understand the phenology rules of Chinese pear florescence of Laohekou in Hubei Province, the author calculated the effective accumulated temperatures greater than or equal to 0, 5 and 6℃ from beginning of spring and rain water to phenologies and its standard deviations based on phenology data of Chinese pear florescence including splitting, budding, early flowering and flowering and meteorological data mainly including temperature, precipitation, humidity and sunshine hours in the past 20 years and the 24 solar terms. The correlations between phenology sequence, days and corresponding meteorological factors were analyzed. The results showed that there were smaller effective accumulated temperatures and standard deviations from rain water to splitting, early flowering and flowering than from beginning of spring to them. As a consequence, the beginning of bud germinating of Chinese pear of Laohekou came closer to rain water. There was a decreasing trend for the standard deviation of the effective accumulated temperature greater than or equal to 0, 5 and 6℃ from beginning of spring and rain water to phenologies. The effective accumulated temperature greater than or equal to 7℃ was 0℃ in some years. Therefore, about 6℃ was ascertained as the minimum biological temperature to decide Chinese pear florescence’ s flowering. The meteorological factors in winter had no significant influence on Chinese pear florescence. However, the effective accumulated temperature after the beginning of spring affected phenologies significantly. Moreover, there were significant impacts of sunshine hours, precipitation and average relative air humidity on Chinese pear florescence during budding to early flowering and splitting to budding, respectively. Finally, the early flowering of Chinese pear was 5 to 16 days later than that of elm and Canadian aspen. The results of this research may provide a good basis for forecasting Chinese pear florescence of Laohekou.