The pot experiments were carried out to study the effects of different forms of potassium fertilizer ratio on rape biomass and nutrient utilization The results indicated that different forms of potassium fertilizer could significantly improve the biomass，potassium nutrient content and potassium accumulation of rape compared with the contrast treatment without potassium fertilization The effect of potassium silicon fertilizer containing citrate acid soluble potassium was better than that of water soluble potassium fertilizer The total rape biomass of potassium silicon fertilizer containing 25% water soluble potassium was the highest It was increased by 663% compared with the contrast treatment without potassium fertilization The potassium nutrient content，total potassium accumulation and nutrient utilization efficiency of potassium silicon fertilizer were increased and then decreased with the increase of water soluble potassium ratio and they reached the higher when the water soluble potassium were 50% and 25% Comprehensive results showed that the potassium silicon fertilizer containing 25% to 50% water soluble potassium was better