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In this study, Zhunge'erqi in Inner Mongolia, for example, in the semi-arid climatic conditions, the construction of rainwater harvesting for supplemental irrigation agriculture. Countermeasures and ways of development of efficient water-saving courtyard economy. The area is located in the Loess Plateau Ecotone of the North, harsh natural environment, serious soil erosion, soil productivity is low, due to over-cultivation and grazing, vegetation destruction, ecological deterioration, in urgent need of governance. Under these conditions, the development of ecological water-saving courtyard economy, ecological stress can be alleviated, and is of great significance for the promotion of regional economic development. The main results are as follows: (1) in the test area, to build a rainwater harvesting facilities is the basis for the development of courtyard economy. Main courtyard rainwater harvesting facilities have the basic form of the the well storing water cellars and ditches. According to the local character of precipitation, can set the courtyard maximum the rainwater potential and existing rainwater harvesting facilities and efficiency collected rainfall and the number of well storing in precipitation and guarantee rate. Courtyard maximum rainfall yield 390.1m 3 , the well storing number 13. (2) is based on a typical courtyard, calculate the average years of set rainfall of 240.7m 3 ; per capita water consumption in high, medium and low level (respectively 30, 20 and 10L / d ), the basic annual water demand were 33,22 and 11m , 3 ; courtyard aquaculture annual water demand in the high, medium, and low levels, respectively 38.04,31.66 and 25.73m ,. 3 ; courtyard farming annual maximum amount of water (drought year) and the average water consumption (average year) were 18.1, and 10.1m 3 . In accordance with the basic limiting factor - life cycle and economic benefits to determine the water priority order: domestic water - the aquaculture water - farming water; 3 most of the internal further refine the priority order of the water. (3) In the courtyard economy farming subsystem in order to improve the mathematical expression in the form of rain economic conversion efficiency = the the R × C 1 × C 2 × C 3 for clues, specific analysis of C 1 , C 2 and the C 3 of these three parameters. When the courtyard area and the road surface area ratio of 1:2,1:1 and 2:1 three cases, C 1 were 48%, 52.6% and 57.0%, respectively. The average for different courtyard and economic crops of vegetables, watermelon and fruit trees, C 2 are the of 21.8,15.6,60.7 kg / m 3 the C 3 0.84,0.42 and 0.50 yuan / kg. For each parameter separately proposed ways to improve the moisture economic transformation efficiency.
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