The situation and mesoscale wind field of the blizzard that occurred from 10 to 12 November 2009 in Shijiazhuang are analyzed in detail by using the conventional observation, radar and 4D VAR inversion wind field data. This snowstorm can be divided into two phases according to the influence system: backflow and west trough snowfall. The backflow snowfall is the main period when the snowfall in the western mountains is obviously heavier than in the eastern plains. In comparison, the west trough snowfall is more uniform in the whole region. It can be seen from the radar reflectivity factor and radial velocity on 10 November that the echoes have convective characteristics, continuously moving towards Shijiazhuang from the western mountain, generating the “train effect” and causing the intensive snow in the urban and western areas. From 11 to 12, the intensity of snowfall is abated along with echoes weakening. On the basis of the 4D VAR inversion wind field, the following results are obtained: (1) The retrieval wind field can accurately demonstrate the time and height of east wind, and the whole influence process of west trough, which is a good reference for forecasters to extrapolate the intensity of snowfall qualitatively. (2) There is a narrow east wind band in low level retrieval horizontal wind field, and the echoes move from west to east along the east wind band. The urban area of Shijiazhang is influenced for a long time due to its location near the north northeast “backflow wall” where the echoes are slowed down and piled up. Meanwhile, the echoes are strengthened or maintained around Shijiazhuang since there exist wind direction and wind speed convergences. (3) In the vertical profile of retrieval wind field, there is an “anticyclone” over the low level east wind during the backflow snowfall period, and the strong echoes are located in the “anticyclone” zone.