现在晋西吕梁山上，以至黄河中游广大山区到处可以见到层层叠叠、平平展展的，水平梯田，这一雄伟壮观的景象令人心情格外舒畅。然而也令人想到四十年以前，这片黄土高原上曾是光山秃岭，起伏不平的坡坡洼洼，广大山区人民祖祖辈辈处于严重的水土流失，广种薄收，十年九旱，亩 Lvliangshan in western Shanxi now, and even in the mountains of the middle reaches of the Yellow River can be seen everywhere layers, flat exhibition, horizontal terraces, this magnificent scene makes people feel particularly comfortable. However, it is also reminiscent of the fact that forty years ago this piece of the Loess Plateau was once a mountain of light and balmy with uneven hills and slopes. The vast number of people in mountainous areas were at serious soil erosion and lost their water for many generations.