| In order to assess the regional drought condition accurately, precipitation anomaly (Pa), standard precipitation index (SPI) and Z index were calculated and their suitability was compared based on the precipitation data of Jinghuiqu experimental station from 1953 to 2011. The results showed that all these indices could reflect the yearly change trends of precipitation, in which, SPI was more sensitive to the change of precipitation than Z index and Pa. In the judgment of drought occurrence, Pa, SPI and Z index showed consistent results; in the judgment of drought degree, SPI and Z index were more accurate than Pa in 1969, 1986, 1993 and 2000 in which moderate or heavy drought happened, while SPI conformed to reality better than Z index in 1977 and 2000 in which heavy drought happened. Through the analysis of SPI change trend in Jinghuiqu irrigation district, it was discovered that 55.6% of drought events occurred after 1990 and drought degree also tended to increase during the study period. In the future, it is of great importance to take rational measures to prevent and control drought in this district. |