Based on the characteristics of manufacturing, from the points of view in Enterprise Resource Planning (ERP), Knowledge Management (KM), and Intelligent Decision Support Systems (IDSS) concepts, this research proposes a relationship model of ERP with critical success factors and production forecast capability along production process by the integration of theory and empirical study of knowledge. By means of questionnaires with hypothesis testing which are then analyzed by SPSS, influence pattern that fits the development of manufacturing enterprise as well as fulfills the improvement of production forecast capability is summarized as the main result of this research. This research provides theoretical complement and practical tools for Chinese manufacturing enterprises to use ERP with KM and IDSS to achieve the purpose of improving enterprise production development.