The seed injected terahertz wave parametric production source (is TPG) is based on stimulated electromagnetic dipole scattering in nonlinear crystals,and has advantages of narrow line width,good coherence,room temperature operation,and tunability.In this paper,the tuning range,output energy,threshold,and other aspects of continuous/pulsed seed injected terahertz wave parametric generation source (is/ips TPG) are investigated based on a 5% molar percentage magnesium oxide doped lithium niobate crystal (MgO∶CLN) of the same composition.Compared to the is TPG system,the tuning range of the ips TPG system is expanded by approximately 80%.The 3 dB bandwidths of the is TPG system and the ips TPG system are 1 THz and 1.41 THz,respectively,accounting for 51% and 39% of their respective tuning ranges.The ips TPG system extends the range of the 3dB bandwidth by 41% compared to the is TPG system.At similar average power densities,ips TPG produces a stronger THz wave output with a maximum conversion efficiency of 1.01 × 10 -5 due to its higher peak power density lowering the threshold.The injection of different forms of seed light has a significant impact on the terahertz wave parametric radiation sources.The experimental results show that the output characteristics of the ips TPG system are more prominent and have higher value in practical applications.The paper concludes with an analysis and outlook of its future development.