Abstract: Compared to conventional transportation means, rail transit has distinct advantages in connecting with airports. Many airport lines begin to shift from a singlemode system primarily based on URT (urban rail transit) to a multilevel rail transit system. Therefore, an adaptability analysis of airport line operation organization modes is necessary. Method: First, the definition and classification of airport line are introduced; then, necessity analysis of airport line operation organization research is carried out; operation organization characteristics of airport dedicated lines, URT extensions, and city (suburban) railways are summarized, and adaptability analysis is conducted respectively; suggestions for airport line planning are proposed. Result & Conclusion: The research results indicate that: airport dedicated lines are suitable for large airports with annual passenger throughput of over 50 million; URT extensions are suitable for airports located not too far from the city center, with annual passenger throughput exceeding 10 million; city (suburban) railways are suitable for airports located at a considerable distance from the city center, particularly in appropriate circumstances of sufficient transportation capacity. Suggestions for airport line planning include: selecting appropriate operation organization modes; accelerating the establishment of airport transportation hubs; combining the characteristics of airport line passenger flow to increase the application of express/local train operation modes; increasing research on luggage handling capabilities.