A reasonable layout of urban park green space （UGS） is an important prerequisite for ensuring equal access to green space resources for urban residents and improving the living level of the city. In traditional UGS planning， the evaluation of urban comprehensive park services based on indicators including green space rate or green coverage rate is difficult to accurately and quantitatively evaluate the balance of the layout of urban comprehensive park. A two-step floating catchment area method based on improved multi-transport mode was proposed for the central urban area of Hefei City. The path planning model of Gaode map， combined with the methods of bivariate local spatial autocorrelation， Lorenz curve and Gini coefficient was used to analyze the accessibility and supply and demand of urban comprehensive parks under different time thresholds based on the signaling data of mobile phone. The rationality of the layout of comprehensive parks in the central urban area was further revealed. The results showed that the traditional method of calculating the accessibility and two-step mobile search model was improved by utilizing the signaling data of mobile phone and the path planning data of Gaode map as data sources. The accessibility evaluation framework of urban comprehensive parks at a micro scale was established， which can accurately evaluate the accessibility of urban comprehensive parks. The accessibility of comprehensive parks in the central urban area of Hefei City is significantly different in space. The areas with high accessibility are usually distributed in the new urban area and the surrounding areas of the comprehensive parks. With the increase of time threshold， the spatial distribution of accessibility level presents a balanced trend. Only about 5% of the residential grids in the central urban area of Hefei City are in the state of supply and demand matching under the time threshold of 15 minutes and 30 minutes. Nearly 7% of the residential grids are in a significant mismatch between supply and demand， mainly concentrated in the western part of the old city and the northern part of lakeside area. It is indicated that the density of residential areas and the number of comprehensive parks is important factors that affect the matching of supply and demand. Optimizing the accessibility of urban transportation to increase the threshold for recreational travel in comprehensive parks in residential areas can significantly promote the overall rationality of the spatial distribution of urban comprehensive parks. It will provide important guidance for optimizing the layout of comprehensive parks in the central urban area of Hefei City in the future.