根据介质屏蔽的氢原子模型求解了单层过渡金属硫化物MoS2中A 激子的结合能及能级谱图，所得结果与二维空间里的玻尔氢原子理论所得结果进行比较发现，介质的屏蔽效应导致处于激发态的激子结合能增大，激发态与基态间的能级间距减小，当主量子数n>8 时，激子的量子化特性才消失而呈现出连续的能级谱.

Binding energy and energy level of an exciton in monolayer MoS2 are calculated by using the dielectric screened hydrogen model. By comparing with the results calculated via Bohr hydrogen model in two -dimensional space，it is found that the dielectric screening gives rise to a larger binding energy in exciton excited states and smaller level spacing between excited states and ground state. As a result，only when the principal quantum number is larger than 8，the quantization disappears and the exciton show a continuous energy level spectrum.