Abstract: In view of that factors influencing construction safety have some gray characteristics,a safety evaluation model based on the gray Euclid relational theory was established and a safety evaluation index system for construction sites was constructed.The weight of each index was decided by the interval analytic hierarchy process(IAHP),which was also introduced to the application of safety checklists.After the gray relative Euclid weighted relational grade was calculated,a safety management level was obtained for the evaluated construction sites.It is shown that under the condition of mastering the inspection data of actual construction sites,better safety evaluation results can be achieved through the model.