This chapter reviews and discusses issues involving the case theory in the generative framework of syntax with data from Chinese, a language without overt morphological case marking. Specifically, it addresses the interrelationship of abstract case, morphological case, and the thematic roles of NPs; the association between the distribution of NPs and case positions; and the possibility of overt vs. covert arguments and the finite tense. The data presented here highlight the variety of ways in which language facts can be described. The challenges to case theory arise not only from the morphological realization of cases on NPs, but also from the flexibility of the number of NPs that can be associated with a given verb, the flexibility of thematic roles associated with a verbal event, and the optionality of word order, as well as the possibility of overt subjects in non-finite clauses. Amid the advancement of cross-linguistic observations, Universal Grammar may eventually inform a holistic account of human languages, in which case theory is superseded by a more fine-grained mechanism for argument-thematic mapping, together with more careful consideration of information structure.