The six generation populations（P₁, P₂, F₁, F₂, B₁ and B₂） were produced from a cross between semi-erectvariety ’Taolyu 218’and erect variety ’Jilyu 10’to analyze inheritances of branch angle in mungbean by mixed ma-jor gene plus polygene inheritance model based on data of every branch angle（ob1） and average branch angle perplant（ob2）, respectively. The results showed branch angles were both dominated by two pairs of major gene with ad-ditive-dominance-epistasis effects plus polygenes with additive-dominance-epistasis（E-1 model）. The ob1 wasmainly affected by two major genes. The ob2 was both affected by two major genes and two polygenes. The role ofmajor genes, polygenes and environmental conditions should be comprehensively considered in plant type breedingof mungbean.