The purpose of this study is to manage the risk factor which can happen in running the information system of marine and port corporations and derive the suitable information system framework by analyzing and assessing the risk factor of information system among the corporations. The probability and impact analyses is constructed and also according to the analytical frame work of information system risk factor, the model for AHP analyses is constructed, and a survey is conducted subject to marine and port information system expert's. By analyzing the survey with AHP, the degree of the relative importance about the information system risk of the marine and port corporation is analysed. We found that marine and port information system expert's thought high level about probability and impact of information risk. Summarizes of the AHP result is as follows; First, it shows that the programing and the development error and the data input error are considered the most important factors by expert's of information system.