Transit-oriented development (TOD) around metro stations is an important measure to support urban low-carbon transportation and reduce reliance on automobiles for travel. At present, several cities in China have reduced the homogenization values of parking allocation indicators for buildings around metro stations. However, few studies focus on the impact of metro station energy level differences, distance differences and other factors on parking demand. Based on the traditional "node-place model" of metro stations, the "connection" dimension evaluation of stations is introduced in this study to evaluate the impact of the transportation transition process from metro stations to surrounding buildings. A quantitative comprehensive index model for TOD of metro stations was constructed to reflect the impacts of metro station types, traffic connection conditions, and travel distances on parking demand changes. A calculation method for the impact of metro station TOD comprehensive index on surrounding building parking allocation indicators was also proposed. Finally, the revision of parking allocation indicators in Nanjing was taken as an example to show the calculation method for the reduction of parking allocation indicators for the buildings around the metro stations based on the measurement of TOD comprehensive index of different urban districts and categories of metro stations.