In addition to helping passengers go out to reach the destination, the conventional bus travel should pay more attention to the travel experience, that is, the sense of happiness during the journey. Based on this, taking Guiyang City as an example, the paper constructs SEM-Logit model to explore the influencing factors of public transport happiness of residents in mountainous cities. The main conclusions are as follows: (1) When residents in mountain cities travel by bus, their happiness is more likely to be affected by bus service and operation service; (2) In the sense of access to bus resources of passengers in mountain cities, the perception of balance and comfort and convenience significantly affects the positive emotions of residents on bus travel; (3) Compared with the traffic community divided by 1000m isometric quadrilateral and road, the built environment index extracted from the street community divided by administrative unit has a higher degree of correlation with residents' happiness of bus travel. (4) In terms of community built environment, population density and per capita length of road network were positively correlated with residents' happiness of public transport trips, while distance to the city center and per capita length of bus routes were negatively correlated with them. (5) The degree of association between satisfaction, sense of gain, built environment and travel happiness is significantly different due to age heterogeneity.