This paper attempts to analysis the relationship between slope and land use in the slopeland around Taipei Basin with an area of 222.88 km2. About 140,000 measurements of slope and land use in this research are obtained from air photos, topographic maps of 1:5000, maps of land use in 1964, 1974, 1984 and field excursion. The data show the changes in area of each type of land use during 1964-1984, from which the expansion of Taipei metropolitan area can be realized quantitatively. For instance, the area of paddy field was decreasing through those 20 years due to enlarging of the urban area. The results indicate the land use of slope lands have been impacted under the influence of slope's restriction, public policy and economic consideration. If the administrative district can not be enlarged to fit the step of urban expansion, the environment of slopeland around Taipei Basin will be impacted more rapidly and deeply.