Based on the Grey system theroy,a grey relation analysis about main factors affecting ani-mal production was made in this paper. The result shows that swine off take rate and grain yield are the key factors affecting pork output(the correlation coefficient(r(y1,x5)=0.894,r(y1,x2)=0.824);proportion of poultry in meat product and grain yield are the main elements influenc-ing poultry production((r(y2,x6)=0.905,r(y2,x2)=0.848);poultry off take rate and grainyield are the chief elements affecting the egg produc...