To address the challenge of providing efficient quantitative quality of service(QoS)guarantees for diverse requirements,this study investigates the QoS performance analysis and optimization of non-orthogonal slicing for eMBB and mMTC in uplink communication systems,leveraging the theory of effective capacity.First,the effective capacity is employed to evaluate the maximum achievable transmission rate under statistical delay QoS constraints,and the effective capacity of eMBB terminals is analyzed.Next,an optimization scheme for non-orthogonal slicing of eMBB and mMTC is proposed,aiming to maximize the effective capacity of eMBB terminals by optimizing their target received signal-to-noise ratio(SNR),while ensuring that both eMBB and mMTC interruption probability constraints are satisfied.Simulation results demonstrate that the performance advantage of non-orthogonal slicing becomes more pronounced with an increasing number of base station receiving antennas.By determining the optimal target received SNR for eMBB terminal power control,the effective capacity of eMBB terminals is ensured,while accommodating the connectivity requirements of mMTC terminals.