With Populus×euramericana (Dode) Guiner CL.‘Zhonglin 46' as material, the 5 endougeneous hormones: indole -3 - Acetic acid (IAA), indole -3 - butyric acid (IBA), gibberellic acid (GA), zeatin (Z), and abscisic acid (ABA ) of cambium from different inclined stem were determined by HPCE tracking. The content of each hormone was compared in different position, different inclined angle and different sampling time to seek the distribution of endogeneous hormones in tension wood of poplar. The main wood p...