In general, Web vulnerability checking is preferred manual method to automatic method because of its accuracy. However, due to limit of inspection’s speed, only some screens in the target web-site are selected for sampling inspection. However, there is no separate selection(sampling) criterion for selecting the screen to be checked when checking the web vulnerability by sampling. Therefore, the selection of the target screen depends entirely on the web vulnerability Inspector. And, It is happen the problems that the results of the checking is different for the same web-site depending on the inspector. In this paper, to solve these problems, we classify the functions according to the function of each page and classifying according to the characteristics of the web-site, an inspection model is created using the performance function. Through the created inspection model, a check case can be created so that it can be used as a criterion for selecting an objective inspection target page. As a result of checking the actual website in the proposed method, it was confirmed that there is no deflection by the inspector in the identification of the screen to be checked.