This paper explores how travel constraints influence seniors' travel decision. By including social support for travel as a moderator in the hierarchical constraint model, we examined the effects of travel constraints, social support, and negotiation strategies on seniors' travel intentions. Face-to-face questionnaire interviews were conducted with Chinese seniors. The results were in accordance with the hierarchical constraint model in general, but also revealed some interesting findings: (a) for Chinese seniors, intrapersonal constraint (health constraint, habit constraint) and interpersonal constraint played a vital role in influencing travel intentions; (b) the negative effect of structural constraint was negotiable, but the negative impacts of intrapersonal and interpersonal constraints were hard to negotiate; (c) the effects of subconstraints at the same level were heterogeneous, for example, the effects of cost constraint were insignificant, while those of time and transportation constraints were significant; (d) social support for travel had a negative moderating role on the relationship between habit constraint and negotiation but a positive moderating role on the relationship between interpersonal constraint and negotiation. Both theoretical and practical implications are discussed.