Russell　and　Subramanian[1-2]　considered　decision-making　model　of　agent　as　an　function,　which　maps　environment　sequence　or　percept　to　action.　This　depiction　can＇t　represent　the　effects　of　internal　state　of　intelligent　agent　to　action　selection.　Wooldridge[1]　considered　internal　state　as　basic　condition　of　representing　an　intelligent　agent.　But　in　his　decision-making　model,　action　can　affect　internal　state　merely　through　changing　environment.　Thus,　the　internal　state　isn＇t　suitable　for　including　mental　state　of　intelligent　agents.　Therefore,　in　this　paper,　we　put　forward　two　decision-making　models　for　intelligent　agents　with　internal　state.　In　these　two　models,　the　action　of　agents　not　only　can　affect　environment,　then　affect　the　internal　state　of　agents　through　the　percept　of　environment,　but　also　can　directly　affect　the　internal　state　itself.　This　depiction　of　internal　state　is　fit　to　include　the　mental　state　of　agent,　thus　provide　a　suitable　model　for　the　decision-making　of　intelligent　agents.　©　2004　IEEE.