134Cs a branching point in s-process path which is shown in Fig.1.The branching ratio is defined as fβ=λβ/(λβ+λn).It could be deduced from the abundance of 134Ba and 136Ba since 136Ba goes through both decay and neutroncapture of 134Cs while 134Ba only experiences decay channel[1].Due to both 134Ba and 134Ba are pure s-process nuclei,this branching point is a good approach to determine the s-process parameters.With temperaturedependentβ-decay rate of 134Cs,the temperature of s-process could be deduced.