Abstract: The meteorological data of 67 national meteorological observation stations in Fujian Province from 1971 to 2020, geographic information data and investigation data of two-line hybrid rice seed production base were used. The climate risk model and grade index in the sensitive period of fertility conversion, and the weather comprehensive hazard index model and grade index in the flowering and pollination period were constructed. The starting temperature index of fertility transformation of sterile line as 23℃ was selected for research. Based on the climate suitability grade standard of two-line hybrid rice seed production, the multi-layer composite method was used to carry out the climate suitability refined zoning of two-line hybrid rice seed production for the safety and high yield in Fujian Province based on GIS. The results show that critical temperature index of fertility transformation of two-line sterile line was 23℃, the fertility transformation were arranged from early July to late July, and from mid-July to early August, the flowering pollination period was arranged in early August and mid-August, the most suitable zone and suitable zone were distributed in northern Fujian, southwestern Fujian below altitude of 300m, the less suitable zone was distributed in northern Fujian, southwestern Fujian at the altitude of 300 to 500m. Fertility transformation was arranged from late July to mid-August, early August to late August, flowering pollination period was arranged in late August and early September, the most suitable zone and suitable zone were distributed in northern Fujian, southwestern Fujian below altitude of 400m, less suitable zone was distributed in northern Fujian, southwestern Fujian at the altitude of 400 to 500m. The low suitable zone was distributed at the altitude of 500 to 1000m. The unsuitable zone was distributed above altitude of 1000m.

Key words: Two-line hybrid rice, Seed production, Safety and high yield, Climate suitability, Zoning