Abstract: In order to provide references to hail disaster research，a new hail database in Anhui province was expended by using of information meteorological records and meteorological dictionaries literature，the spatial temporal distribution differences between new database and previous database was analyzed. The results showed that the hail records increased from 793 to 2079 after expansion. The annual occurrence frequency of hail presented decadal variation in both two databases，and increased significantly before the year of 1974 and 1972 by using of the Mann-Kendall trend test（P＜0.01）. The hail occurred frequently in spring and summer，rarely in autumn and winter. The hail occurred typically from 15:00 to 17:00. However，the variation rate of hail occurrence from previous database was smaller than from the new database. The peak number of monthly hail occurrence appeared in March in old database，and in June after expansion. In general，the hail spatial distribution of expansion database included the main paths，which reduced research uncertainties

Key words: Hail days, Observation data, Database expansion, Comparative analysis