This research is to evaluate the suitability of slopeland use in Taipei. The first step is to scrutinize the morphographic growth curve and determine the most appropriate size of grid within the experimenting area. The land conditions (L), comprising slope, rock characteristic, and vegetation cover ratio as the assessment index, is presented as a whole to find its correlation with the physical geographic conditions on slopeland. By evaluating the assessment index, it is expected to rank the land conditions and thereby acquire its equivalent quantitative value. The up-to-date land use status is hereby taken into account to perform as an assessment mechanism. It is concluded to use U/L ratio as the criteria to evaluate the suitability of land exploitation. By setting this evaluation model, not only can it be the guideline for checking further land exploitation in Taiwan but also establish the regulatory plan of land use.