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基于 DSJ （3040）粒子性质尚未确定这一课题，利用组分夸克模型（CQM ），研究半轻衰变过程 BS → DSJ （3040）l-ν．认为 DSJ （3040）是由c和珋s组成的激发态，它的自旋宇称为 JP＝1＋，sl＝3/2，属于 T类型的双重态（1＋，2＋）．理论计算得到了数值结果，其分支比为0．9％～2．7％，这对最终确定 DSJ （3040）的性质、检验CQM模型的合理性有重要意义．“,”The characteristic of the DSJ (3040) has not confirmed .Based on the assumption that the ex-otic state DSJ (3040) is constituted by c-s with JP=1+ and sl=3/2 ,and belongs to T doublet (1+ ,2+ ) ,the semilepton decay BS→ DSJ (3040)l-νis studied by the CQM model .The numerical results are obtained and the branching ratios range from 0 .9% to 2 .7% .This work is in favour of confirming the characteristic of the DSJ (3040) ,and checking the rationality of the CQM model .