Analysis on grain yield main impact factors based on the time-series trend graph in China

On the basis of China's grain production sample data since the reform and opening up, eight main factors which affected total grain yield were selected, such as sown area, the amount of chemical fertilizer, effective irrigation area, affected area, total power of the machinery, index of the cost of grain production, grain production price index, financial funds supporting agriculture. Then these factors were divided into three classes: material inputs, resources and environment and policy factors. It emphasized multi-angle analysis one by one on the typical impact factors by applying the time -series trend graph. On this basis, it proposed corresponding countermeasures and suggestions that how to improve the overall grain production capacity.