Because the habitual decision exists in mode choice behavior, how to break this habitual decision and extend travellers' habitual domains is a very important issue in transportation behavior research. For discussing the extension of habitual domains, we must realize the interaction of attributes in decision making for mode choice. This research determines reachable domains by using the habitual domain theory and fuzzy theory. Then, we find the travellers' habitual attributes of decision and construct the interaction model of attributes in rechable domains for discussing habitual extension under the specific stimulus. Beacuse we use the connectivities of attributes to set up our model, we call it the connectivity network model. Finally, a two-stage questionnaire approach is used for the empirical study of motorcycle users in Taipei.