The key definitions of spatio-temporal data modeling are summarized and the requirements of spatio-temporal database community, including temporal semantics, spatial semantics, spatio-temporal semantics and query capabilities are specified. Through the investigation on the applications of the existing spatio-temporat data models in spatio-temporal domain, a comparison among these models for evaluating their capabilities in the four fields above mentioned is provided and the various approaches are assessed. As a result, spatio-temporal object-oriented data model and moving object data model behave more strongly in the expressions of the spatio-temporal objects.