Under the guidance of the agricultural system theory, operational research theory and decision-making support system theory, the regional agricultural development decision support system (RADDSS) was developed in this study ,in which different analysis method and models was integrated. By providing data, right models and analysis methods, RADDSS can assist decision-makers and administrators to solve half-structured and unstructured problems, improving level of management on agriculture. The agriculture in Xuchang has been analyzed using the system constructed in this study. The distribution of local agricultural production elements was rather reasonable, indicating that the district was suitable for agriculture development. The insufficient agricultural investment is the main factor that limits yield, and the more investment, the better yield. The level of agricultural modernization in Xuchang for nearly 20 years has been rising gradually, but still at the initial stage. The agricultural sustainable development potential index of Xuchang was 40.2, which was still at a low level. The gross output value of agriculture in Xuchang was predicted to undergo year-on-year growth. Fourteen multiple cropping patterns were designed and chose by RADDSS, and then the Effiency-oriented and grain-oriented program were proposed. The above-mentioned results indicate that the system can be applied to the analysis and decision-making of regional agriculture.