In order to define the composition range of bone china body with use of calcium phosphate, kaolin, quartz and feldspar as raw materials, we varied calcium phosphate from 40 to 55wt/o and selected basic composition by the change of raw materials in ternary system. After these bodies were fired at 120$0^{circ}C$, 123$0^{circ}C$, 125$0^{circ}C$ and 128$0^{circ}C$ their properties were closely tested to determine the compositions and firing conditions of bone china body.