Using 1 h, 6 h, 12 h, and 24 h annual maximum rainfall data of Guangdong Province and the buffer zone around it, the hydrometeorological regional L-moments frequency analysis method was used to obtain rainfall quantile estimates, and the high-risk rainstorm areas(HRRAs)of Guangdong Province were investigated. The results show that Guangdong Province was delineated into 13, 15, 16, and 16 hydrometeorological homogeneous regions(HMHRs)for 1 h, 6 h, 12 h, and 24 h annual maximum rainfall data, respectively. The best-fit frequency distributions for most HMHRs were generalized extreme-value and generalized normal distributions. The spatial distributions of rainfall quantiles for the same duration were similar at different return periods, while there were certain differences for different durations. HRRA of 1 h data was located near Yangjiang along the southwest coast; HRRAs of 6 h, 12 h, and 24 h data were located around Yangjiang, Guangzhou of Pearl River Delta to Qingyuan, and Lufeng on the east coast.