Rice blast and bacterial blight are two significant diseases in rice, causing huge yield and quality losses. Breeding resistant varieties is the most cost-effective approach to reduce their harm. In this study, using molecular marker-assisted selection and GSR40K chip detection, we introduced the rice broad-spectrum resistance genes Pigm and Xa23 into the japonica rice variety Ning84. We obtained three new lines carrying the two genes. The resistance identification results showed that Pigm introduction significantly increased the resistance to seedling blast and panicle blast of Ning 84, the resistance frequency of the three new lines to 41 rice blast strains during seedling stage ranged from 63.4% to 97.6%. The resistance to leaf blight of the Ning 84 improved lines imported into Xa23 all reached the level of “resistance” or above, its resistance significantly improved. The results of examining the agronomic traits of the improved lines showed that some lives had significantly increased grain width, thousand grain weight, and spike length, while other agronomic traits and yield did not differ significantly from Ning 84. The results of GSR40K SNP gene chip analysis showed that the background response rate of the three improved lines was 94.89%-96.58%. The results of this study indicated that the introduction of Pigm and Xa23 could significantly increase the resistance level of Ning 84 to rice blast and leaf blight, and has no obvious negative effect on agronomic traits and yield.