To study the atmospheric deposition in Shanghai, we have collected deposition samples in August, September and October in 2014. The concentration,spatial distribution and composition of sixteen polycyclic aromatic hydrocarbons (PAHs) were analyzed. Atmospheric deposition fluxes of ∑15PAHs at eight sampling sites were also calculated. The potential sources of PAHs were apportioned by positive matrix factorization model (PMF), which could produce a quantitative interpretation. Our results indicated that the total concentrations of PAHs ranged from 0.458μg/L to 21.013μg/L in atmospheric deposition. Furthermore, the PAHs concentrations in dissolved phase varied from 0.174μg/L to 0.625μg/L, while in particulate phase from 0.275μg/L to 20.455μg/L. The atmospheric deposition flux of ∑15PAHs in sampling sites ranged from 0.24μg/(m2?d)to 14.74μg/(m2?d)and the mean deposition flux of ∑15PAHs was 2.77μg/(m2?d). According to the apportionment results using PMF model, the first major sources of PAHs were categorized as mobile vehicle exhausts, such as gasoline car exhausts and diesel car exhausts, which constantly contribute 40.23% to the total PAHs pollution. Another four sources (residential cooking, coal combustion, oil spill and volatilization, coking and coal smelting) identified by PMF model, account for 23.73%, 14.75%, 14.35% and 6.92% respectively.