The Chemical Oscillations and quasi-Chemical Oscillation are diservated first time en the chemical syetem of Br_2with the synthetic products of Br_2+C_2H_2, C_2H_2Br_2+CHBr_3+C_2H_2Br_3+CBr_4+C_2H_2Br_4, lmder favourable conditions and far off Chemical equilibrium state of this system. though the reactive process is very complex, these phenomena of cyclic variation or quasi-cyclic variation are observed in this expriment. These phenomena are discussed. The Project Supported by Science Foundation of Tianjin.Laser Chenistry 1,1,2,2,-tetrabromoethane. 1,1,2-tribromomethone, bromine, ethylene dibromide.