The Coast Act was amended, and in addition to "protection", elements of "environment" and "use" were added. The method of evaluating these three elements objectively and determining a priority to perform suitable coastal preservation in a limited source of revenue has not been developed yet. Thus, this research develops a systematized method using the Analytic Hierarchy Process for the priority assessment of coastal preservation. Five criterions, which are "importance of hinterland", "aging of structures", "use", "economy", and "environment", are employed for the assessment. As a result of using the method, it turned out that evaluation of the priority of coastal preservation in Osaka Bay is possible. Furthermore, it is expectable that more accurate assessment can be performed by using more additional evaluation criteria and detailed data.