In these years, numerous models have been developed to measure transport accessibility for different purposes. In order to explore the differences in transport equity measure caused by different accessibility calculation methods, this paper takes the data of Haining, Zhejiang Province as an example, and establishes the public transportation network space database with ArcGIS 10.5 software. We use buffer method (assuming a uniform distribution of population within areas),network ratio method (assuming a uniform distribution of population along the road network) and distance decay method (population decays along the road network with the distance to the station) to measure bus stop accessibility. Based on this, we obtain the bus Zenga index of three accessibility methods respectively, and compare the differences between different methods on the equity of urban and rural public transport. The results show that compared with the buffer method, the Zenga index calculated by the road network ratio method and the distance decay method is reduced, and the impact of the two methods in the city is smaller than that in the rural area. The research shows that the Zenga index obtained by the buffer method is high and the error is greater when used in rural areas. It is more objective to evaluate the results of public transport equity by considering the reachability method of population distribution characteristics. Keywords: Transportation economy；Public transport；Accessibility；Equity；Zenga index

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