The semi-arid area of Loess Plateau is an ecological sensitive area in landscape architecture. The main issue that local settlements confronted with is the shortage of water resource and vegetation. Taking the study of the relation among water, green (vegetation), and human into consideration, focusing on catchment and greening, ecological rehabilitation, and industrial planning, the theory of “water-green win-win” can be combined with landscape spatial planning to generate four principles: order, type, layout, and capacity. According to four typical typography as pond and river bank area, gully area, mountainous slope area, and tableland area, four spatial modes can be constructed. The ecological spatial modes are possible to guide landscape planning in semi-arid area, and hence improve the human settlements.