Abstract: The selection of suitable sites and right season is vital to the success of the seed production of the two-line hybrid rice.The suitable climate regions and periods for seed production were determined to provide the decision making support systems for the seed production,based on the historic climate data and the requirements for the meteorological conditions during the different periods of the seed production.The historic data of the temperature,precipitation and relative humidity were analyzed by using Visual Basic 6.0,and storaged by Extensible Markup Language(XML),based on Geographic Information System(GIS).The best region and season for seed production in Hunan was identified based on climate data for the last 50 years.The results obtained using this system matched well with the current identified season and location most suitable for seed production in Hunan Province.This decision making support system is very helpful in decision-making related to two-line hybrid seed production.

Key words: Two-line hybrid rice, Two-line hybrid rice, Seed production, GIS