The aim of this study is to investigate passive·causative suffix ‘-li-’ used in ergative verbs ‘ulida, nalida’ are polysemy. So far discussion is little for grasping semantically passive form and causative form of ergative verbs, mostly they were dealt with in syntactic aspect. Before this, the discussion about what the ergative verb exists in Korean must antecede. This study tries to prove polysemy of the above verbs under premise that the ergative verb exists in Korean.1) It will refer to morphological, syntactic similarity by basis in respect of assertion that ergative verbs ‘ulida, nalida’ are polysemous. It also will present that all passive form and causative form have the quality of de-action and the passive form involves causativity.