This research focused on effects of lapped length of Kanawatsugi-joint (Japanese traditional timber joint for beam to beam) for compressive properties.E-graded Hinoki(E110 and E90) and Sugi(E90) were shaped Kanawatsugi-joints, and each joint had either lapped length of 240, 300 or 360mm.The followings were found from the result of compressive experiments of Kanawatsugi-joints.1)Splitting, embedment and crush of cells were occurred on Mechi (grooved point) and Komisen-dowel, 2)A lapped part was curved in a direction of perpendicular to the loading axis, 3) Compressive strength of H110(E-graded 110 Hinoki) was 80-100% of design strength and that of H90(E-graded 90 Hinoki) and S90(E-graded 90 Sugi) was 60-70% of design strength, 4)Initial stiffness was 40-60% as large as Young's modulous, 5)The longer lapped length Kanawatsugi-joint had, the smaller compressive strength was on the same grade, 6)The distinct properties was not found between initial stiffness and E-grade,7)Initial stiffness was positively correlated with compressive strength.