Abstract: The analysis of economic development plays an important role in effectively establishing the target of future economic development, drawing up reasonable economic development policy and measures, and promoting good sustaining development of regional economy. This paper studies the relation of main factors affecting national economic development. According to different research goal and different factor, this paper establishes a series of econometrics models including macroeconomic system model, production function model, time series model, analyses the compatibility of these models. Combing the statistics of Jiangsu provincial economic development, this paper forecasts the development level and trend of Jinagsu provincial economy from 2001 to 2005.