本文根据长江中下游地区中生代侵入岩长石Pb同位素组成和Nd同位素模式年龄研究，提出长江中下游地区是由几个晚太古-早元古代和中元古代块体组成的变质基底；其地壳的形成具有多阶段演化的特点，大致是：晚太古代（＞2500Ma）形成古陆核，早元古代（2500－1900Ma）陆壳初步形成，中元古代（1800－1200Ma）陆壳快速增长，晚元古代（1000Ma）以后区内陆壳增生基本趋于停止。 Based on the study of the Pb isotope composition and Nd isotopic pattern ages of Mesozoic intrusive rocks in the middle and lower reaches of the Yangtze River, the authors propose that the middle and lower reaches of the Yangtze River are metamorphosed basalts consisting of several Late Archean-Early Proterozoic and Middle Proterozoic blocks. The formation of a multi-stage evolution of the characteristics are generally: Late Archean (> 2500Ma) the formation of the ancient continental nuclei, Early Proterozoic (2500-1900Ma) continental crust initially formed, Mesoproterozoic (1800-1200Ma) rapid growth of continental crust, late After the Proterozoic (1000Ma), continental crustal hyperplasia tended to cease.