Six kinds of RP smokes mixed with difference oxidants including Fe₃O₄,Fe₂O₃,MnO₂,CsNO₃,SrNO₃ and combustible Mg were prepared seperatly, Their smoke shaping times, sedimentation rates and extinction coefficients to 10.6 μm laser were tested in a smoke chamber. Results show that the smoking time RP smoke with CsNO₃ and SrNO₃ are 20 s and 15 s, and the sedimentation rate are 0.0021 m·s^-1 and 0.0019 m·s^-1, and the extinction coefficient to 10.6 μm laser increase 41.9% and 38.7% respectively. SrNO₃ is better as oxidant for RP than CsNO₃.