To study the dynamic properties of bubble rising in the water, a simulation model of single bubble under buoyancy and gravity in still water was established by CFD software. Taking hydrostatic pressure gradient into consideration, the no  slip technology was applied to deal with the boundary of flow field, and the whole structured grid technology was used to deal with the bubble and still water area. Using this model, bubbles of 2.6 mm and 4mm diameters were simulated to analyze the movement mechanism of the bubbles in still water. The numerical results were further compared with the test data. The rising route and velocity were well consistent with the test data. The approach in this study offered an effective solution to investigate the dynamic properties of bubble in water.