The secondary outflow of Handan East Sewage Treatment Plant and its advanced treated reclaimed water were taken as the evaluating objects.The fecal coliform group was taken as the health safety assessments index,and Monte-Carlo technology was used to carry on the simulation of model establishment and the certainty of probability distribution,then simulation of health safety certainty of evaluating objects which were reused for urban reclaimed water consumption was carried out by using Crystal Ball soft.The results show that the sanity safety of the secondary effluent and advanced treated effluent reused for scenic environment and groundwater recharge consumption will be lower without disinfections.So the disinfections process in advanced treatment process is necessary to ensure the sanity safety of reclaimed water.