Aiming at solving the outstanding problems such as the serious pollution of urban rivers in China and the frequent occurrence of eutrophication, a numerical model of particle tracking, hydrodynamics, water quality and eutrophication was constructed. Taking the Magical Ocean World, a typical playground landscape river in Zhenjiang City as an example, the improvement of hydrodynamics and water quality without water diversion, pumping, and self-diversion was simulated. The results showed that the residence time of particles in the three winds was east wind> southeast wind> south wind. The maximum residence time of particles in the east wind was 125 h, the maximum residence time in the southeast wind was 115 h, and the maximum residence time in the south wind was 95 h. When there is no water diversion, the velocity of the central landscape lake area was smaller under the three wind field conditions, and the water depth at the coast was more affected by the wind speed than at the shallow depth, and slightly higher velocity was shown downward in different winds. With pumping, the water pumped continuously for 30 h was better than that of 20 h. For self-diversion, the greater the difference Δh between the water level of the river and the artificial lake, the better the water quality of the artificial lake.