Proceeding from national conditions of China,it is an only way to ensure the basic demand of social economic development and grain production that the middle-and-low-yielding fields are improved and utilized.The authores analysed and researched the distribution situation and soil characteristics of main middle-and-low-yielding fields according to the mountain area cultivated land resource state.Then the measures to improve and use all kinds of middle-and-low-yielding fields are proposed.