Taking Jing'an district of downtown in Shanghai as an example, the paper selected 580 catering and service industries in four seasons of 2000 and analyzed discharge levy according to cover 1000 monitoring data. The case study shows: ①The accumulative pollution load proportion of CODcr and Oil exceeds 95%, so they are the typical pollution factors in wasterwater.These trade that discharge wastewater above 1000tons per month are main pollutant headstreams for their total pollution load proportion is beyond 60%. The relationship betweenpollutant concentrations and scales of enterprises is negative and the concentrations are much thicker in amount of small scales trades. ② The relationship between the discharge levy amount and the total pollution load retains a highly positive correlation.The unit price ascends with increasing pollution load containing in per ton wastewater and they significantly accords with cubic estimation model. ③ The average unit price in Jing'an district at the level of 0.26yuan is lower than the average pollution abatement cost of 0.56yuan in wastewater plants in Shanghai.Based on above data analysis,the paper discussed regulating approaches on discharge levy of catering and service industries, such as implementation of all-out levy, combination of total quantity and concentration controlling, et al.It intends to supply external foundations for discharge levy standard and monitoring model in catering and service industries.