<p>Tropical cyclone precipitation is a major cause of severe natural hazards. This study analyzes the influence of tropical cyclone intensity, translation speed, and vertical wind shear on precipitation asymmetry using satellite precipitation data, ERA5 reanalysis dataset, and IBTrACS best track data from 2001 to 2020. Results reveal that tropical cyclone asymmetry gradually weakens with increasing storm intensity while it strengthens with higher translation speed and vertical wind shear. Quantitative analysis indicates a more critical role of vertical wind shear in modulating precipitation asymmetry compared to translation speed. These three factors affect storm precipitation individually, and also modulate each other. Specifically, storm intensity is suppressed under backward vertical wind shear. This suppression becomes more pronounced as the vertical wind shear enhances and the absolute angle between vertical wind shear direction and storm motion direction increases. Correspondingly, tropical cyclones exhibit stronger precipitation under forward vertical wind shear than backward. Unlike the intensity suppression mechanism, the rain rates under high vertical wind shear are consistently higher than those under low, with the exception of backward right vertical wind shear. Composite analyses demonstrate that the rainfall preference and the heaviest precipitation are typically located to downshear left. Nevertheless, when the shear is directed towards the rear left relative to the storm motion, the weakened cyclonic circulation under strong backward vertical wind shear reduces its capacity to transport precipitation to the downshear left. In this case, it appears that the forward preference of the rainfall generated by storm motion dominates the precipitation structure. The rainfall preference and the heaviest precipitation are both located to downshear right.</p>