With ginseng as experimentalmaterial，6 concentrations of silicon were setup:0(CK)，0.03(T1)，0.06(T2)，0.09(T3)，0.12(T4)and 0.15g/L(T5)were used to explore the change trend of the influence of different silicon concentrations on the growth and development of ginseng. The results showed that different concentrations of silicon application had positive effects on leaflength，stemlength，rootlength，leafwidth，stemdiameter，root diameter and biomass of ginseng. The optimal concentration of silicon application for promoting ginseng growth was 0.09 g/L. Silicon application had a positive effect on the improvement of photosynthetic capacity of ginseng. Intercellular CO₂ concentrationreached the maximum value under T2treatment，which was 4.01% higher than that in CK. The stomatal conductance reached the maximum value under T3treatment，which was 100% higher than that in CK. The net photosynthetic rate reached themaximum value under T3treatment，which was 136.47% higher than that in CK. The transpiration rate reached the minimumvalue under T3treatment，which was lower than that in CK by 27.54%. The overall resistanceintensity ofroot，stem and leaf of ginseng could be enhanced by increasing the enzyme activity of active oxygen defensesystem(peroxidasecontent)and reducing the degree of celldamage(malondialdehydecontent). Different concentration of silicon application increased and accumulated silicon content in ginseng. The optimal treatment of silicon application to enhance the absorption of ginseng silicon was 0.09 g/L. In terms of differentparts，the distribution of ginseng silicon in topdressing treatment was leaf> root>stem. From the perspective of differentperiods，the end of the green fruit period and the beginning of the red fruit period may be the best period for ginseng toabsorb silicon. Insummary，the optimal silicon application amount of ginseng is 0.09 g/L. This experiment provides a practical basis for promoting the growth and development of ginseng and enhancingresistance， and provides a reference for the applied silicon concentration of ginseng in farmland cultivation.