本文通过分析杜甫“大拗”律诗的声律 ,说明杜甫的拗体诗拗而不乱 ,自有其变化规律 ,并未违背律诗在声律应用上的基本原则 ,即平仄相对 ,平仄和谐 ,用粘对的规则组织句子。杜甫的拗律在音律上是小拗而大顺 ,在字数、句数、对仗、用韵上都符合律诗的要求 ,所以应该属于律诗。 This article analyzes the phonetic system of Du Fu’s “Big Tau” poem. It shows that Du Fu’s poesy poem is not disturbed and chaotic, and has its own variation law. It does not contravene the basic principles of the application of law of temperament, that is, Use sticky rules to organize sentences. Du Fu’s tonic law is a small bend and generous in the rhythm, in the number of words, sentences, battle, with rhyme are in line with the requirements of the law, it should belong to the law.