The trajectory characteristics of lunar return reentry are determined by cosmic velocity dynamics. The model of reentry problem is established. Based on the trajectory characteristics analysis of lunar return reentry, we obtained the following conclusions. First, entry angle has a significant effect on downrange, heating rate and g-load. A small entry angle can significantly improve heating and g-load environment. Second, bank reversal has no significant effect on downrange, heating rate and g-load, but has a significant effect on cross-range, which provides a basis for the vertical and lateral decoupling guidance. Third, the maximum heating rate always appears before the first peak g-load, and decreases with the decreasing of entry velocity. Thus, it requires the vehicle to achieve decelerating adequately and effectively in the initial descent phase and then skip out of the atmosphere to improve the heating environment.