A method is offered in this study for automatic selection of seeding a reas for weather modification via computer software techniques based on various data with different resolution from radar, satellite, numerical model results an d upperair sounding etc. The method separates the whole area into several smal l square areas forming several small matrixes. By means of dealing with various d ata and analyzing the correlation between these data and certain small areas, it can be determined whether these small areas can be seeded or not. After taking all the small areas as sparse matrixes and adopting the storage mode of orthogon al chain table, all the seeding areas can be found out automatically based on t he algorithm of adjacent search. The algorithm, data and storage structures are d escribed in detail in this paper. The method makes it easy to select the seeding areas automatically with various data on the basis of computer software techniq ues. It can be applied directly into decision-making of aircraft operation and a rtillery (rocket) operation for weather modification and is important to the ope ration modernization of weather modification.