For the sake of transferring qualitative evaluation into quantitative one in the airport functional section suitability evaluation, the principle of fuzzy comprehensive appraisal is applied to this subject and the plan of certain airport is taken for example in exploring some key techniques in this process in combination with GIS. The result of evaluation reflects the internal request of each airport function section preferably. The model of evaluation expresses the effect of each factor on the suitability of function section planning closely. This sets up the foundation for carrying out the airport planning computer decision system finally.