Recent research has revealed the importance of China’s People Congress deputies for authoritarian resilience and explained the historical and individual variations in their behaviors, but the regional variation in the performance of deputies among different local congresses still has not been explored. Based on an original dataset of Municipal People’s Congresses across China, this article illustrates that the variation in the deputy activity of local congresses is mainly caused by the uneven development of the local economy. The results of different statistical models all show that the per capita numbers of deputy proposals of congresses are higher in the regions with larger GDP per capita. The study provides a new explanation for the behaviors of People’s Congress deputies in China and contributes to the research on the performance of subnational authoritarian parliaments.