Objectives The genetic stability of Zaozhuang Heigai pigs was studied to monitor the effect of conserving Zaozhuang Heigai pigs. Methods Indexes including the reproductive performance, growth and development performance, growth and development performance of fattening pigs, slaughter performance, and the performance of reserve pigs of Zaozhuang Heigai pigs were measured for two consecutive years from 2022 to 2023. The changes in main genetic performance of Zaozhuang Heigai pigs were analyzed. Results The reproductive performance was stable within 2 years, with no significant differences. The growth and development, and fattening performance of fattening pigs in 2023 improved slightly compared with that in 2022, with an average daily weight gain increase of 13.82 g and a decrease in feed to weight ratio of 0.04, but the difference was not significant. In terms of slaughter performance, there was no significant change in the body mass of slaughter, slaughter rate, backfat thickness, lean meat percentage, and other indexes of Zaozhuang Heigai pigs within two years. In terms of performance of reserve pigs, only the average daily weight gain of reserve sows in 2023 significantly increased compared to 2022(P<0.05), while other indexes had no significant differences within two years. Conclusions The main genetic performance of Zaozhuang Heigai pigs remained stable and slightly increased within 2 years, and the effect of conserving Zaozhuang Heigai pigs was currently good.