High-level public transit helps to alleviate urban traffic congestion. To evaluate public transit accurately and improve planning and management standard, a comprehensive evaluation method based on Internet open data is proposed for public transit system from three aspects: the traditional evaluation of public transit, the accessibility evaluation based on PTAL and residential POI, and the competitiveness evaluation under different travel modes. Songjiang District of Shanghai is chosen as a case to illustrate the proposed method. The results show that the network density of Songjiang transit meets the corresponding standards, the layout of stops and routes not only takes the potential travel demand into consideration, but also conforms to the spatial distribution of residential areas to some extent. However, there are several problems related to Songjiang transit such as low coverage and irrational locations for stops, serious detour for routes, as well as long travel time and weak competitiveness for the whole system. It is expected that the proposed methods will provide reference for the transit system planning and evaluation in the future.