China's economy has entered a new stage of development.In order to effectively promote the modernization of its national governance and governance capabilities，it is urgent to quantitatively and precisely forecast the future trend of China's economy.The paper is based on the present conditions and systematical forecasting goals of China，to identify the related research theories and methods，and focused on the establishment of macroeconomic forecasting system using large structured macroeconomic econometric models targeted selection and setting of economic indicators to form a system of variables operating system model，and finally based on empirical data and comprehensive evaluation of the model given the estimated results.