Models-3/CMAQ and Brute Force method were applied to simulate the ozone pollution and to analyze how meteorological condition influenced the pollution characteristic and the source apportionment of ozone during July 2014 in Baoding. The distribution of ozone concentration in Baoding gradually increased from west to east. In July, the high ozone episode mainly occurred when southern air mass, southeastern air mass and eastern air mass arrived, and the percentages of polluted days were about 28%, 39% and 17%, respectively. During the maximum eight hours of ozone, background and cross regional transmission contributed about half of concentration of surface ozone. As for the regional contribution, Hebei contributed about 2/5 of the surface ozone. Henan contributed about 1/10 as well as Shandong and Jiangsu. The rapid increasing contribution from central Hebei and influences of vertical transportation from Henan and Shandong province leaded to rapid increasing of surface ozone concentration during the daytime in Baoding; most regional contribution changed gently except for central Hebei area, which resulted in high ozone concentration and long duration in the afternoon as well as the single peak diurnal variation.