Through the research of the impact of the response function of the whole national economy findings, using the vector regression model (VAR model), the author analyzes that agriculture has significant role in promoting the whole national economy and has longterm continuous effect, fully shows agriculture plays an important role in support of national economy, the basic position In the three industries of national economy, the contribution of the third industry for agricultural is minimum, and the rate declines from the sixth year The contribution of the second industry for agriculture is growing year by year Therefore to strengthen agriculture, an economy should vigorously develop secondary industry, give full play to the second industry continued to promote agriculture However, for its own positive effect more attention, agriculture in the first year of their contribution to the peak is slow down, but has more contribution than the second industry greatly in 50 years Therefore, strengthening the construction of agriculture itself is to strengthen the position of agriculture as the foundation of the root