传统观点认为 ,杜诗《夏日杨长宁宅送崔侍御常正字入京》写于大历三年荆州。这是错误的。从该诗所言及的“西江”、“扬雄宅”、“长宁”、“夏日”并结合历史典籍来考证 ,该诗应写于永泰元年泸州。诗中的杨长宁与杜甫有一定的交往 ,与戴叔伦等颇熟。该诗是一首应酬诗 ,其写作技巧较为圆熟 ,是杜甫应酬诗中质量较高的一首 According to the traditional view, Du Fu’s “summer Yang Changning house to send Cui Shi Yu Zheng orthographies into Beijing” written in Dali three years in Jingzhou. This is wrong. From the poem referred to “Xijiang”, “Yang Xiongzhai”, “Changning”, “Summer” and a combination of historical textual research, the poem should be written in Yongzhou the first year of Luzhou. Yang Changning’s poems have some contacts with Du Fu and Dai Shulun et al. The poem is an entertainment poem, its writing skills are more mature, is Du Fu’s high quality entertainment poem