Fularji district of Qiqihar is a typical heavy industry district in China. Gas and particle phases air samples were collected using active air sampler at upwind and downwind of the district in order to study the occurrence, pollution characteristic, and gas/particle partitioning of polybrominated diphenyl ethers (PBDEs). The results indicated that the total concentration (gas plus particle phases) of PBDEs ranged from 13.9 to 102 pg·m^-3 with the mean concentration of 53.6 pg·m^-3, and BDE-209 was the dominant congener. According to the results of source analysis, PBDEs in air were mainly originated from Commercial Deca-BDEs and Commercial Penta-BDEs. The slopes obtained from the linear regression between log K_P and log p_L^o were lower than the theoretical value of -1, suggesting the non-equilibrium between gas and particle phases. The particle bound fraction (φ) values were modeled using the Junge-Pankow Adsorption Model and the Harner-Bidleman Absorption Model. The values of φ from both the two models were overestimate compared to those obtained from field measurement.