In shallow surface flow constructed wetland constructed in the laboratory, with domestic sewage as the study object, the optimum hydraulic load and the relation between removal of organics / total phosphorus and dissolved oxygen of the system is discussed. The optimum hydraulic load for operation of the system obtained by experimental analysis is 0.2m3/m2.d, and the relation between dissolved oxygen and removal of organics is more general than the relation between dissolved oxygen and removal of total phosphorus.