The filed experiment was carried out for researching the relationships between the different potassium fertilization effects,soil available potassium contents and the optimum fertilizer rates of maize on the different types of soil.The results indicated that there was a functional relation between potassium fertilizer rates and maize yields.The measured value of soil nutrients was supreme straightly negative correlation with potassium fertilizer rates,which can be the significantly scientific bases for the optimum fertilizer rates of maize on the different types of soil.