Pion photoproduction process in the ∆33 region is investigated on the basis of the one-particle-exchange model. In order to examine the applicability of this model we directly analyse the original experimental data, that is, differential cross sections, recoil nucleon polarizations, polarized photon asymmetries and polarized target asymmetries. In addition to the usual Born terms, s-, t- and u-channel exchange contribution of N11, ∆33, N13, ρ and ω are taken into consideration. K-matrix method is adopted to guarantee the unitarity. It is shown that the experimental data in low energy region can be well reproduced by the one-particle-exchange model. The results obtained are compared with those from other analyses.