Lectin protein is a main antinutritional factor in mature soybean seed. The Le gene controls a lectin protein. Plant breeders can use molecular markers to select indirectly individuals in segregating populations that carry a gene for a favorable trait if a tight linkage exists between a marker locus and the genetic locus controlling that trait. The objective of this research was to identify RAPD markers linked to Le allele using bulked segregant analysis. Cultivar "Gaechuck#2" (LeLe) was crossed with PI548391(lele, absence of lectin protein) and F1 seeds were planted. The F1 plants were grown in the greenhouse to produce F2 seeds. Each F2 seed from F1 plants was analysed electrophoretically to determine the presence of the lectin protein band. F2 individual plants were grown in the greenhouse. Young leaf tissues from each F2 plant were collected. At maturity, single F2 plants were harvested. Random F3 seeds from individual F3 seeds harvested were selected and were used to confirm the presence of the lectin protein band. The dominant and recessive F2 plant leaf bulks consisted with ten F2 individual plants were made. 1,000 Operon random primers were used to screen polymorphic band between dominant and recessive bulk. The presence of lectin protein is dominant to the lack of a lectin protein and lectin protein was controlled by a single locus. A few primers that shows polymorphism in bulked samples were selected and were used to obtain segregating data in F2 individual plants.