Abstract: According to the principles of land evaluation, Land Resource Assessment Information System(LAIS) was established based on softwares and hardwares of personal computer and Windows platform. It has the edition and safekeeping functions of data such as building , adding, repairing and deleting database. All kinds of factors of land appraisal were analysed, and four types of the membership function models of these factors, i．e．Stype, inverse Stype, ∧type and parabolatype, weredeveloped based on the principle of fuzzy maths． The Hierarchy Analyst Process (AHP) was used for deciding the weight of these factors, then the models and methods were integrated with the LAIS, so land assessment was finished rapidly. LAIS can be connected and communicated with ARC/INFO， thus the input of spatial data and the output of land evaluation topical map were realized in LAIS.