Abstract: To explore the evaluation method of site quality in the Taih-ang Mountain, this article evaluated the site quality of Robinta pseudoacacia L. in this region from the aspect of its productivities, ecological properties and economic benefit by a series of qualitative and quantitive methods. The site productivities were measured by site index and standard stand volume, the ecological properties by soil erosion durability and water conservation, and the economic benefit by site expectation price.