Abstract: Analysis of three rainstorms occurred on 8-9 April 2017, 2005 and 2019 in Hubei province were carried out using conventional observations, hourly surface observation. 192, 120 and 144 h backward trajectories were simulated and studied based on HYSPLIT model and 6-hourly NCEP reanalysis data. (1) The results showed that three rainstorms happened with 500 hPa trough, vortex, shear lines, low level jets and cold front and divergence at 200 hPa. (2) In general, water vapor mainly comes from the middle-low troposphere during three rainstorms, especially below 3000 m and contributed more. But the source region, the movement and the way of picking up moisture of air parcels are different in three rainstorm processes. Air parcels ended up over 5000, 7000 and 9000 m came from outside of China are dry air and contribute little. But air parcels ended up over 500, 1500 and 3000 m originated from different areas. Air parcels ended up over 500 m came from the north of Indo China Peninsula, East China Sea and the south of rainstorm area with the highest specific humidity. Air parcels ended up over 1500 m originated from the north of rainstorm area, the east of Bay of Bengal and the south of rainstorm area with higher moisture. Air parcels ended up over 3000 m came from Yellow Sea and West Asia area with moderate water vapor. Air parcels picked up moisture mainly from sea surface, secondly from land surface in “2017” and “2005” cases, but air parcels picked up moisture mainly from land surface in “2019”case. There are diversity and complexity of moisture source and transport. (3) With the advantage of synoptic situation, beside the water vapor from South China Sea with subtropical monsoon, moist air from rainstorm area and its surrounding regions is very important.