In this study， six cultivars （lines） of Pueraria montana （Loureiro） Merrill containing ‘Guige 8’， ‘Gange 5’， ‘Huangjinge’， ‘Heshui Fenge’， ‘NYG1’ and ‘NYG2’ were used as the research objects， and their floral morphological characteristics were observed and compared. The results show that the calyx of P. montana is bell shaped， connected at the base， and divided into 4 petals in the middle； the calyx tooth length is 1.38-2.00 cm and the calyx tooth width is 0.42-0.64 cm； the vexil is suborbicular or oblong， the petal is fusiform. at the front and interrolled forked at the base， and the keel encloses stamen and pistil； the stamen is a diploid stamen， with a length of 2.12-2.36 cm； the pistil length is 2.42-2.68 cm. On the whole， the calyx tooth length， vexil length， vexil width， stamen length and pistil length of ‘Heshui Fenge’ are the largest， and the calyx tooth width， petal length and keel length are also large. The differences of floral morphology of different cultivars （lines） of P. montana can provide reference for the breeding of its new cultivars （lines）.