Abstract: Combined with the characteristics of natural resources endowment and ecological environment in Hancheng City, multiple types of basic data are used to progressively construct an evaluation system of ecological protection importance based on the ecosystem service function and ecological sensitivity indexes as well as their secondary indexes, which provides theoretical basis for the territorial spatial planning and scientific delineation of ecological protection redline in Hancheng City. The results show that the high-level area of ecosystem service function is 442.00 km², dominated by biodiversity conservation function. The high-level area of ecological sensitivity accounts for 45.46% of the total area of Hancheng City, with land sandification and rock desertification playing the leading role. The high-level area of ecological protection accounts for 52.51% of the total area the city, showing an expanding trend to east and south from the Huanglong Mountain Nature Reserve. The soil sandification, rock desertification and biodiversity conservation function have great impact on the importance of ecological conservation.