In this paper, a system for analyzing the strategic adjustment of regional agricultural industries in China is briefly introduced, particularly on several system functions of database, region selection, statistics, comparative analysis and result presentation in terms of their technical realizations. The introduction is focused on the realized comparative advantageous agricultural analysis computation methods and assessment recommendations. From this paper, we can see an application of a knowledge based system for regional advantageous agriculture analysis. Technical process of system analysis and system design for developing such a knowledge-based system is presented.