Abstract: At present,coal-mixing technique in China only bases on.request of calorific value and volatile matter of coal,but not comprehensively conside factors such as kindling point,combustibility,aggregate and desulfurize and so on,which brings about quality of coal-mixing cant meet the demand of boilers burnt.In this paper,nonlinear optimize technology is applied in power coal-mixing,by considering 10 index of coal-mixing such as calorific value,volatile matter,sulfur,moisture,ash,melting point,fire trait,combustibility,aggregate trait and let trait of SO₂.Mathematics model is founded in power coal-mixing with nonlinear optimize theory.With safisfying restrict conditions,certain index is seek to reach best,which meets the requirement of security and environmental protection.