The optical stopping effect in undopeel and low concentration Sn- and P-doped As2S8 amorphous thin films is studied experimentally. The optical stopping response curve, experimental data of room temperature deexcitation and spectral testing data of the samples are provided. The results show that, the Sn-doped sample can significantly improve the ms range response in the fast-recovery process, and has the effect in decreasing the residual propagation loss. But in P-doped sample, the effects are contrary to that in the Sn-doped sample. Based on the experimental results, some analysis and discussions are presented.