The Content (concentration %) of each components of Br_2with the Synthetic products of Br_2andC_2H_2, C_2H_2Br_2+CHBr_3+C_2H_3Br_3+CBr_4+C_2H_2Br_4+Br_2, is great changs between the magnetic field and without, that is observed in this paper. The results were analysed and discussed. The projiect Supported by Science Foundation of Tianjin