The effects of Bi and Sb additions on the microstructures and casting properties in lead-free Cu-Zn-Sn broze were investigated. (1) When only Bi was added to the bronze, Bi was precipitated on the ${delta}$ phase of ${alpha}$ dendrite cell boundary. When Bi and Sb were added together, Bi was precipitated on the ${delta}_A$ which was the Sb-rich area in the ${delta}$ phase. (2) The addition of Sb accelerated the formation of ${delta}$ phase, and when Sb, Bi and Pb were added, Bi and Pb were precipitated as mixed solution in the ${delta}_A$ phase. (3) The combined addition of Sb and Bi resulted in the suppression of shrinkage due to the complementary effects of the mass feeding of ${alpha}$-dendrite cluster covered with ${delta}$ phase and sealing of micro-shrinkage in the ${delta}$ phase by solidification expansion of Bi.