Scalar relations have been restructured in the contemporary capitalism. In post-reform China, many scalars are transformed and constructed with the transition from state socialism to market economy. This article examines the process of rescaling state power from the perspective of politics of scale, using a case of province-leading-city reform in Jiangsu province. By examining the role of government at various levels in the province-leading-city reform, it is argued that the province-leading-city reform is a rescaling of state power, involving up-scaling and down-scaling of powers. Due to power reshuffling in the rescaling process, there are intense power struggles among scalars in both vertical and horizontal dimensions.