系统工程是目前世界上一门新兴的学科,它对社会生产力的提高和国家繁荣昌盛起着巨大的推动作用,因此,把系统工程理论应用到各项建设事业上,也越来越多。只要系统工程在某项事业上一旦产生实际效果,就会把事业迅速推向前进,对于我们水土保持建设事业又何尝不是这样! 陕西是全国水土流失最严重的一个省,流入黄河的泥沙占黄河总输沙量16亿吨的一半,流入长江的泥沙占长江总输沙量7亿吨的1/10。建国以来,全省治理水土流失面积4.6万平方公里,占流失总面积33.5％,平均每年治理近1300平方公里,若按这种进 System engineering is an emerging discipline in the world. It plays a huge role in promoting the improvement of social productive forces and the prosperity of the country. Therefore, systematic engineering theory has been applied to various construction projects more and more. As long as systematic engineering has a practical effect in a cause, it will push the cause forward rapidly. This is not the case for our cause of soil and water conservation construction. Shaanxi is the most serious soil erosion in the whole country, and sediment inflow into the Yellow River accounts for The total sediment discharge of the Yellow River is 1.6% of that of the Yangtze River, accounting for 1/10 of the total sediment discharge of 700 million tons of the Yangtze River. Since the founding of the People’s Republic of China, the province has managed 46,000 km2 of soil and water loss, accounting for 33.5% of the total loss and an average of nearly 1,300 km2 per year. According to this approach