This article establishes a set of index system for evaluating the extent to coordinated development of environment-economy system in Jinhua City of Zhejiang Province, using mean square error method to determine the weight of each indicator and applying an evaluation model to calculate the coordinated development degrees of Jinhua City from 1998 to 2011. Results indicate that coordinated development of environment-economy system in Jinhua City has experienced four stages: elementary coordinated development and environment-economy synchronization(in 1998), medium coordinated development and environment-economy synchronization(from 1999 to 2002), medium coordinated development and delayed environment behind economy(in 2003), and better coordinated development and delayed environment behind economy(from 2004 to 2011). The coordination degree of environment-economy increased year by year. In Jinhua City, there is a larger gap between economic strength and environmental carrying capacity. Delayed environment is the dominant factor restricting best coordinated development and environment-economy synchronization in the city.