This study was conducted to examined the effects of TIBA and ethrel on podding rate, percentage of seed numbers per pod, and seed yield of black soybean. The black soybean variety “Geomjeongkong 1” was used. TIBA of 50, 100, and 150 ppm and ethrel of 500, 1,000, and 1,500 ppm were applied at V6 (fifth leaf stage), V8 (seventh leaf stage), and R1 (flowering stage). The podding rate was increased by the treatment of TIBA at R1 stage while it was decreased by ethrel at all growth stages. Compared with control, TIBA decreased 100 seed weight a little bit but ethrel increased it slightly, on the contrary. Both TIBA of 50 ppm and ethrel of 500 ppm increased the sued yield by 8 to 28％ compared with control regardless of growth stages of application; the highest seed yield was obtained at V6 stage of application of 50 ppm in TIBA and 500 ppm in ethrel, respectively.