Abstract: At present, zinc injection technology is used in PWR to reduce the corrosion product source term in primary circuit, however, the theoretical mechanism and calculation analysis of the effect of zinc injection on corrosion products are relatively lacking. In this paper, the effect of zinc injection on corrosion products and source terms in primary circuit was demonstrated and analyzed from the aspects of theoretical mechanism, program development, numerical calculation analysis and experiment verification. The theory calculation indicates that zinc injection can significantly reduce the dissolution of nickel and cobalt in the basic metal. With the increase of running time, zinc injection inhibites ⁵⁸Co and ⁶⁰Co in primary coolant, that is, it shows a trend of gradual decline over time. The ratio of experimental results and theoretical calculation of zinc injection is within the range of 0.5-2.0, which is in good agreement. This study can provide theoretical support for rational application of zinc injection technology in nuclear power plants.