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In this paper, the system engineering theory and methods, a comprehensive evaluation of the Loess Plateau 400-500mm rainfall with typical forest agricultural production and operation mode Pengyang County, for example, on the basis of the evaluation, the internal agricultural agroforestry ecosystem , forestry, animal husbandry and land use structure optimization. The purpose of the evaluation is based on the existing agroforestry production business model is based on better production and operation mode selected through comprehensive evaluation, the better the production and operation mode selected directly for farmers to produce in the region farmers help out of poverty, and provide reference for decision-making services for all types of decision-making; purpose of optimizing the overall planning of land use structure in the region, land use program put forward practical help for the concrete implementation of the returning farmland. Application of AHP on the Loess Plateau, 400-500mm rainfall band typical agroforestry production model to evaluate research, evaluation, output value, labor net income, capital input ratio, cost, utilization, and payback period of five economic indicators the 4 social indicators of the forest cover rate, five ecological indicators of the amount of soil erosion, cropping index rate, the system inundated rate, soil nutrient balance index, the labor capacity of richness, product commercialization rate mode demonstration role . The evaluation results show that: the comprehensive benefits of agroforestry structure score highest, with an average of 0.4843, a preferred structure; forestry structure effective evaluation value is also higher its mean to 0.4427, but it can not coordinate the economic, ecological, and the relationship between the social benefits can not be counted as a preferred structure; evaluation of the value of the lowest of the comprehensive benefits of traditional agricultural structure, its mean to 0.1754, the worst of the structure. Foresters composite structure exists between the various modes of production are significant differences, wherein the fruit drug binding mode comprehensive efficiency of the highest score value, its value is 0.6471, and is a preferred mode; lam drug combination mode, the grass combination mode, comprehensive evaluation value of the land the ridge of Almond Apricot mode and fruit crop intercropping patterns are also higher, better mode of production, around references can be reasonable under the circumstances. Pengyang County, for example, the application of the linear programming method agroforestry ecosystems within the agricultural, forestry, animal husbandry and land use structure optimization, detailed analysis before optimization Pengyang agriculture, forestry, animal husbandry and land structure Utilization, and its existence The main problem and the measures to be taken. The results show that: by optimizing Pengyang County farming land area of ??32,029 hectares less, reducing the area accounted for 13% of the total land area; forestry land area of ??6214 hectares, the increase in the area of ??accounting for 3% of the total land area; grassland area 25,865 hectares, an increase of 10% of the area of ??the total land area. Adjust the same time, the internal structure of farming, forestry, grass industry, in particular, to increase the area of ??economic crops and high-yielding economic forest, so local farmers can continue to increase their income. Seen through the feasibility analysis of the optimization program: optimization scheme is feasible in resource utilization are feasible in terms of economic, ecological and social applicability optimized Pengyang County agriculture, forestry, animal husbandry and land use structure more more rational.
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