The accessibility means how much difficulty of one region links other areas, which also reflects the opportunity of each node interaction in the transportation network. Accessibility decides breadth and depth of urban spatial interaction, which is great significance for the town, reflecting the status of town in the transportation network, as well as the potential for future development. With the development of computer technology and geographic information systems, accessibility research has become increasingly mature, the study mainly involves road, rail, aviation and other modes of transportation, including studies of spatial pattern, regional effects, regional location, urban hinterland and so on. which the gravity model approach, shortest distance method, shortest travel time, grid technology Act and others widely used in different spatial scales up to measure of country, urban agglomerations, provincial (city) domain.①The study results show that:1the average urban accessibility improved to varying degrees from 1996 to 2012, the total time value reduced by 358.52 hours to the 215.74 hours, which decrease of 39.82%;②city's accessibility presence space differences, and have varies of enhance rate. Central region and eastern coastal areas are high value area of accessibility, because of location and transports advantages, but rates of enhance of the edge areas are higher than central areas over the years.③spatial pattern of urban accessibility changed greatly. All of those show highways and high-speed railway construction directivity. In fact, accessibility changes and evolution of spatial patterns reflects the strategic requirements of Zhejiang regional and rural development.