Using the computational fluid dynamics (CFD) component transport model and SST k?ω turbulence model, A series competitive nitride reaction between naphthol (component A) and para aminobenzene sulfonic acid (component B) was used as the working system to determine the concentration distribution of materials in the range Re=3000~9000 in the Lightnin static mixer. The concentration distribution, turbulent flow, and micromixing characteristics of each component in the chemical reaction field were analyzed. The Lightnin insert can promote the efficient process of the main reaction in the tube. The by-product S was small and its concentration was between 0.0004 and 0.03 mol/L, while the concentration of the main product R was two orders of magnitude higher than that of the by-product S. The turbulence intensity increased obvously with the increasing of Re. The peak value of turbulence intensity reached 2.95, which was 2.02 times than the minimum value at the exit when z/l=2 and Re=3000. The critical value of turbulent kinetic energy appears when wA=0.7, and the turbulent kinetic energy increases with the increase of concentration when wA<0.7, and turbulent kinetic energy decreases with the increase of concentration when wA>0.7. The turbulent dissipation rate decreases gradually with increasing of radial distance and concentration. Compared with wA=0.5, the turbulent dissipation rate of z/l=10 decreases by 2.43%, 8.86%, 19.80%, and 42.25% under wA=0.6~0.9. The radial-flow number is distributed periodically which is formed a small peak value in an even number of the swirl element, while a concave trend in the odd number at Re=6000~9000. Under the condition of the same mole ratio and concentration of components A and B, the micromixing characteristics at the outlet increased by 18.22%, 30.38%, 38.91%, 45.52%, 50.97%, and 55.34% respectively at Re=4000~9000 compared with Re=3000.