The dispersion model for metallic dielectric properties plays a crucial role in the numerical simulation of metallic optical properties and dictates the result of the simulation.To date,a variety of dispersion models have been proposed and implemented in different fields.In this paper,in order to study the suitability of the metalli c dispersion models in the simulation of the optical properties of metal surface plasmons,we show a concise analysis on the relationship between common dispersi on models and complex dispersion models.We analyze the common dispersion models for gold and silver using the MATLAB nonlinear fitting method,and obtain the fit ting results in the 180－2000nm band.The results show tha t the Debye model is not suitable for metal materials,the Lorentz model is suita ble for describing the dielectric properties of metals in L-band,the Drude mode l can describe the metallic dielectric properties in the 600－2000nm band and the simple Drudy-L orentz model gives a good fitting for the metallic dielectric properties in the 180－2000nm band.The results are also verified by the Mie sc attering theory.This pa per shows that the Drude-Lorentz model is suitable for the simulation of optica l properties of metal surface plasmons over a broad band of 180－2000nm,and it may be employed in the finite element method (FEM),finite di f ference time domain (FDTD) and discrete dipole approximation (DDA) methods to ch aracterize the metal surface plasmons.