In the present study, nutritive soil modifier (hereinafter abbreviated as NSM) was applied to three kinds of acid soils with different characters. An indoor soil incubation experiment was conducted and a greenhouse soil pot experiment was conducted with corn plants(Zea mays L.). The major results showed,when the native potassium content in the soil was high , NSM could improve potassium adsorbed and prevent potassium from losing; when the native K content in the soil was lower, NSM could activate potassium and increase potassium availability in the soil; NSM could improve the nutrient environment of soil hence to increase the uptake efficiency for potassium, leading to a better growth of the maize plants.