In order to promote the application of big data in enhancing the governance efficacy of urban governments in China, this study evaluates 75 urban governments using the "Evaluation Index System for the Government Efficacy Using Big Data" developed by the Center for Network Society Governance of Nankai University. The results show that among the four evaluation dimensions, the top 20 governments generally perform better in institutional guarantee and governance capability than in governance performance and public participation. The imbalance exists between regions as well as between cities at different administrative levels. On this basis, several suggestions were put forward.