[Objective] The aim was to study the relationship between endogenous hormone levels and the pod lengths in Brassica napus L.[Method] Two specially-long pod lines H218 and H203,two normal pod length lines MSP334,Zhongyou 821 and two short pod lines ＂4101＂ and Zeng 11,were exploited as experimental materials,and the endogenous IAA,iPA,GA3 and ABA content in the pods of the materials were analyzed with the method of enzyme-linked immunosorbent assay（ELISA）.[Result] IAA contents in the specially-long pod lines were lower than those in the short pod lines on the 1st and 5th day after blossom.IAA contents on the 5th and 20th day were negatively correlated to the final pod length respectively.iPA contents in the specially-long pod lines were lower than those in the short pod lines on the 5th and 20th day.iPA content on the first day was positively correlated to the final pod length,but iPA content on the fifth day,the tenth day and the fifteenth day were negatively correlated to the final pod length.GA3 content on the 1st day was positively correlated to the final pod length.ABA content on the 1st day was negatively correlated to the final pod length.[Conclusion] It was shown that iPA and IAA played important roles in the development of pod length in the B.napus lines.
