利用BESIII实验数据来寻找D-->a0(980) eν和Ds-->a0(980)0 eν半轻衰变过程， 在这些过程中带电a0(980)和中性a0(980)都能产生，粲介子到a0(980)的跃迁矩阵元用一个可参数化的形状因子来描述。实验测量a0(980)在D和Ds介子半轻过程的产生几率用以约束理论模型，联合Ds和D介子的半轻子衰变测量，对于理解a0(980)的内部结构和形成机制有重要意义。 同时在实验上抽取动量依赖的形状因子，将为研究a0(980)的内部结构提供动力学依据。而通过不同的a0(980)衰变模式的重建，我们可以得到a0(980)与eta pi和 KK的相对耦合强度。 BESIII将首次测量粲介子通过半轻过程到a0(980)的跃迁几率，这是BESIII粲物理实验研究的重要方向。同时，我们也可以通过D/Ds三体达里兹衰变研究a0(980)的产生及性质。

The semileptonic D/Ds-->a0(980) eν decays can be used to study the inner structure of a0(980). In this decay, the final state interaction can be clearly described by the momentum-dependent form-factors, both charged a0(980) and neutral a0(980) can be produced. Therefore, by measuring the decay rate of neutral D and charged D meson semileptonic decay, one can extract important experimental information on the form.of the a0(980) from different quark-antiquark pairs. The couplings of a0(980) to eta pi and KK can be obtained too. In addition, the transition rate will depend on the momentum-dependent form-factors, which can be extracted from the partial widths of the semileptonic decays. These measurements will provide unique information on the inner structure of a0(980), which is hot topic of the hadron spectroscopy. At the same time, we cam also probe a0(980) production and properties in D/Ds Dalitz decays.