Abstract:The spatial temporal characteristics, the background of atmospheric ci rculations and the relevant physical elements of the haze weather are statistica lly analyzed based on the observational data and NCEP/NCAR reanalysis data durin g the period from October 2006 to February of the next year. The results show th at higher frequency of the haze occurs in October, December, January and Februar y, and a high incidence of haze mainly occurs at about 11:00-14:00. The main syn optic situations of haze are partitioned into three types, namely the blocking h igh over middle latitude pattern, southern branch trough pattern and zonal circu lation pa ttern. The physical elements exhibit variations form north to south, especially obvious in humidity. During haze occurrence at 14pm, relative humidity is less t han 80% in Huanan Region, 70% in the middle lowvalley of the Yangtze River, less than 6 0% in Huabei Region. The visibility is relatively low in parts of Guangdong Province and Huanghuai Region. Above results are valuable to understand the forming mechanism and to establish forecast system of haze.