Combined the statistical analysis of Beijing urban haze from the year of 2014 to 2017 with the clustering results obtained by HYSPLIT backward trajectory mode, spatial characteristics and variation of main pollution transport pathways and potential source-zones were identified. The study revealed that the overall air quality in Beijing urban area kept improving during the study period, with the incidence of haze dropped from 50.6% in 2014to 33.7% in 2017and the occurrence of haze days decreased from 165d to 78d. Every year, haze always concentrated appears during coal heating period from October to the next March. The occurrence frequency of the different intensity haze has been decreasing year by year, both the frequency and the intensity of haze pollution happened in autumn and winter seasons declined gradually. There are three main pollution transport pathways in the Beijing-Tianjin-Hebei area, including the southeastern plain area of Hebei, the east foot of the Taihang Mountain and the south foot of the Yan Mountain, which altitudes were all below 1000m of the ground, corresponding to the Beijing average concentration PM_2.5 of 124.1μg/m³ during the study. The frequencies of main transport pathways have reduced gradually, and the contributions to PM_2.5 of Beijing by the same trajectory were also declined. Major potential source-zones of PM_2.5 in Beijing urban area has gradually narrowed to center-south parts of Hebei and northwest Shandong from the north China plain and the Tianjin port, with the decreasing contribution rate of the air pollution from the transport pathways. The favorable weather conditions and the control of human-derived regional emissions were the 2major causes of the air quality improvement in the last 4years.