The empirical research on the relationship between government transparency and government service level in China is an important research blank. Therefore， this study takes the information asymmetry caused by principal-agent relationship as the entry point， combines the theories of integrity of government and discretion of local government in the Context of China， and proposed the hypothesis of the influence characteristics of government transparency on the improvement of government services under different conditions. Then， taking enterprise services of local governments as an example， panel data of 292 Cities in China from 2017 to 2019 are used as research data， and econometric models such as panel data regression and threshold regression are used to explore the impact of government transparency on government service level and the threshold effect of government transparency， government integrity and local government autonomy. The results of empirical analysis show that the improvement of government transparency significantly promotes the improvement of government service level; In the areas with high degree of government transparency， integrity and local government autonomy， this promotion effect is more obvious; the reverse is less obvious. At the same time， the above conclusions are always valid in the eastern region; In the central region， the threshold effect of government autonomy is still obvious， the threshold effect of transparency is not obvious， but the threshold effect of integrity is different. When the autonomy of government in northeast China is low， the result is contrary to the hypothesis， neither the effect of transparency nor integrity is obvious. In the western region， the threshold effect of transparency， integrity and autonomy is not obvious. Therefore， it can be speculated that under the background of the reform of "delegating regulation and providing services"， the improvement of local government service level has reached a certain height， and the further optimization of services has put forward higher requirements for the governance and innovation capabilities of local governments. The government transparency construction， anti-corruption and decentralization measures can only play a supporting role.