Stem strength is one of the major influencing factors of lodging in soybean [Glycine max (L.) Merr.].To identify quantitative trait loci (QTL) associated with stem strength and related traits in soybean, a recombinant inbred line (RIL) population consisting of 165 lines derived from Zhongdou 29 × Zhongdou 32 was used in three years, and a prostrate tester was engaged for testing stem strength.Four traits, stem strength, stem diameter, nodes on main stern, root weight were positively correlated with each other at P<0.01.