【重点、难点突破】我国的高、中、低产田的比例是29∶30∶41,中、低产田比例高达71%。基于我国土地后备资源的匮乏,要促进农业的进一步发展,就必须改造中低产田,提高单位面积产量。黄淮海平原,是我国中、低产田的集中分布区。旱涝、盐碱、风沙危害,成为制约黄淮海平原农业发展的三大障碍。 [Key and Difficulties Breakthrough] The proportion of high-, medium-, and low-yielding fields in China is 29:30:41, and the proportion of middle- and low-yield fields is as high as 71%. Based on the scarcity of our country’s land reserve resources, and to promote the further development of agriculture, we must reform the low-yield fields and increase the yield per unit area. The Huang-Huai-Hai Plain is a concentrated distribution area for middle and low-yielding fields in China. The drought, flood, salt, and wind hazards have become the three major obstacles to the agricultural development in the Huang-Huai-Hai Plain.