Transit hubs are the fundamental facilities to anchor the urban transit network system and to connect various passenger transport modes. This paper makes a definition of transit hub''s connotation at first, analyzes the functions and characteristics of transit hub, and then represents the evolution of transit hub''s spatial structure. Optimal transit hub locating strategies are designed under two basic scenarios: pre-determined transit network and unknown transit network. Under the pre-determined transit network case, the optimal strategy can be described as 'service zoning and route classifying', while under the unknown transit network case, the optimal strategy can be summarized as 'hub hierarchy, service zoning and route classifying'.
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