Abstract: Using regular sounding data, automatic meteorological observing stations data, satellite images and the reanalysis data of NCEP, three continuous rainstorm cases that happened in Sichuan Basin from June to July in 2013 are analyzed regarding the large-scale circulation backgrounds and physical environment conditions. The results show that the blocking of the high pressure ridge from Lake Baikal and Okhotsk sea at 500hPa help the deep trough near the Siberia and Balk hash Lake splitting shortwave and eastward-moving stably. The positive vorticity advection before the trough transport to the Sichuan Basin continually and bred the genesis and development of the mesoscale and microscale system in the lower layer. The southwest vortex causing three heavy rains is directly influence system, and the activities of southwest vortex have an important effect on the area of strong precipitation. The warm advection at 850hPa maintains. The max region of the warm advection gradients trigger mesoscale convective system (MCS) to produce the strong rain, and the stronger the warm advection, the more precipitation.The southwest warm-wet monsoon airflow from the Bay of Bengal transport the moisture and heat continuously, which is helpful to rebuilt energy rapidly after release. The proper dynamic environment is beneficial to the vapor gathering, convergence and vertical uplift, which cause the heavy rainfall continued. The convergence caused by the northerly and southerly component of the wind, when the southwest jet at 700 h Pa strengthening northwards, is beneficial to the convergence become strong near the area of heavy rain, and cooperating with the suction mechanism of high-level divergence, the above mentioned is an important factor of the three heavy rainfall processes maintained.