The effect of phosphorous fertilizer dose on growth, development and yield of spring vegetable soybean was investigated at Gia Lam, Hanoi to identify optimum phosphorous fertilizer dose on two soybean varieties, DT02 and AGS346. The experiment was performed in triplicate in a split - plot design. It was shown that phosphorous fertilizer dose of 90kgP2O5ha-1 plus 30kgN + 60kgK2O ha-1 is optimal for leaf area index, dry matter accumulation, number of nodes, number of pods per plant and pods yield for both varieties.