The formation and evolution of the sectional temperature distribution, thermal front and thermocline in the Yellow Sea during the April to August warming period were simulated with a two-dimensional model. Numerical hindcast experiments were made in five main sections of the Yellow Sea. The hindcast temperature at surface and bottom layers, the thermocline depth and the position of the thermal front at the bottom agreed with measured data. The distribution of temperature and the evolution of stratification were well reproduced by the model. Stations with hindcasted temperature errors less than 2℃ and 1. 5℃ made up 84% and 72% of the total respectively, and the positions of tidal fronts with hindcasted error less than 45km made up 92% of the total. It is shown that the simulation taken with the model is successful and the model may be used to prognostic the thermal front and sectional distribution of temperature of the Yellow Sea.