傣族是云南少数民族中存在有丰富的成文法律文献的民族。傣族传统法律的成文法制定上大量把习惯认可为法律。习惯成为他们制定法律时的重要渊源。傣族传统法律中习惯因素在法律中的影响表现在行政、民事、刑事和纠纷解决的立法上。傣族传统法律中,习惯因素在整个法律上的作用并没有构成基本成分。从传统成文法看,傣族传统法律中习惯仅是很小的部分。 Dai is a ethnic group in Yunnan that has a wealth of documented legal documents. The traditional law of the Dai law has a great deal of formality recognized as law. Habits became an important source of their lawmaking. The influence of customary factors in the traditional Dai law in the law is manifested in the legislation on administrative, civil, penal and dispute resolution. Dai traditional law, the customary factor in the entire legal role and does not constitute a basic element. Judging from the traditional written law, the customary practice of Dai is only a small part.