This study was performed to compare the characteristics of hydraulic conductivity such as relative conductivity(RC), leaf specific conductivity(LSC), Huber value(HV), specific conductivity(SC), and diameter of vessels(㎛) and number of vessels(No./㎟) in branch junctions of the twenty-one deciduous broad-leaved species. The hydraulic conductivities of branch junctions decreased with increasing junction angle between stem and branch, and with decreasing diameter of branch. The RC and LSC of branch junctions related to branching types( ㅏ , Y, Ψ type) were much lower in ㅏ and Ψ types than in Y type. The diameter and number of vessels remarkably reduced in branch junctions as compared with the stem and branch.