Analysis of the of Different Causes between Mao' Poems Xu and Zhuan

There are 34 poems,which have differences between Xu and Zhuan in Mao' poems.Some are incompatible,some are not corresponding,and some are not involved.The different causes are various; The explaining emphasis between Xu and Zhuan is different;Xu is unclear and self-contradictory;Zhuan misreads lection;Xu and Zhuan have different documentary sources;Continued Xu and Zhuan all expound from the first Xu,but have different viewpoints;Zhuan revised some Xu;Xu and Zhuan have been added.