在句法结构中，藏语动词范畴不仅会受到自身语法功能的制约，同时还会 受到和其它范畴交互分布的制约。本文采用制约条件相互作用的理论分析了藏语动 词诸范畴在句法结构中的制约关系。有些动词不具有某些形态变化是因为其某些范 畴的交互分布违反了相互制约条件而不出现在表层结构，有些范畴的出现不具有强 制性是因为尽管属于合格的句法结构，但是它们和其它范畴的交互分布和谐性等级 不高，因而受到表层分布的限制。 In syntactic structure, the category of Tibetan verbs not only is restricted by their own grammatical functions, but also restricted by the interactional distribution with other categories. This paper analyzes the constraints of the categories of Tibetan verbs in syntactic structure by using the theory of constraints interaction. Some verbs do not have some morphological changes because their interactional distributions of certain categories violate the constraints of each other and do not appear in the surface structure. The appearance of some categories is not mandatory because, despite their qualifying syntactic structure, they are not associated with others The level of interaction and distribution of the categories is not high, which is limited by the surface distribution.