According to this experimentation, silicon fertilizer’s efficiency to increasing yields is close related with sorts of Si-fertilizer. The increasing yields distance about applying Si-fertilizer different quantity is 4.0%～11.1%. Applying Si-fertilizer for the most yield is 495 kg/hm² and one kilogram Si-fertilizer can increase 1.69 kg of rice’s yield. Optimum applying Si-fertilizer quantity is 402 kg/hm², the ratio is 1∶3.2 between input and output. The interactions efficiency is the highest to cooperating Si-fertilizer, P-fertilizer with potassium fertilizer on the basis of N-fertilizer. Applying Si-fertilizer can reduce the rate of the rice topple and can increase capacity of the rice resist ance to rice blast and rice sheath blight.