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通过对太行山片麻岩区生态工程综合评价认为，生态工程具有较高的保水效益，保水率可达６０％～９３％，以隔坡梯田最高，最大保水量相当于４４０．４ｍｍ的降水；生态工程可防止土壤侵蚀，使土壤侵蚀模数减少到１８４．２～３６１．２ｔ／（ｈｍ￣２·ａ），相当于荒坡的１／１６～１／７；生态工程可使洪水历时减少７０％，洪峰最大流量减小８０％，从而使下部农田免受损失，损失率减少９８％以上。山地生态工程的直接经济效益为４０００元／ｈｍ￣２以上，间接可计算经济效益３７７５．２３元／ｈｍ￣２，合计为７７７５．２３元ｈｍ￣２以上。此外，生态工程促进了山区农民的脱贫致富及荒山绿化，在大灾之年成了山区农民的“保命工程”，具有显著的社会效益。
According to the comprehensive assessment of ecological engineering in the gneiss area of Taihang Mountains, the ecological engineering has high water retention efficiency, and the water retention rate can reach 60% -93%. The terraced slope terrace has the highest water holding capacity and the maximum water holding capacity is equivalent to 440.4mm precipitation. The project can prevent soil erosion and reduce the soil erosion modulus to 184.2-361.2 t / (hm ~ 2 · a), which is equivalent to 1/16 ~ 1/7 of the waste slope. Ecological engineering can reduce the flood duration by 70 %, The maximum flood peak flow reduced by 80%, so that the lower farmland from loss, the loss rate decreased by 98%. The direct economic benefits of mountain ecological engineering is 4,000 yuan / hm ~ 2 or more, indirectly calculate the economic benefits of 3775.23 yuan / hm ~ 2, a total of 7775.23 yuan hm ~ 2 above. In addition, eco-engineering promoted the peasants in mountainous areas to get out of poverty and afforestation, and became the “life-preserving project” of peasants in mountainous areas in the catastrophic years with significant social benefits.