Abstract: The mass density resolution is one of important characteristics of industrial CT(ICT). When the performance test for ICT density measurement was carried, the partial mass volume should be considered in the concoction of the liquid density phantom. This paper revealed the notable difference between the real density values of the phantom and the proposed values by the current standards GJB 5312. The calculation formula to overcome the partial mass volume effect was given, and the concocting method of liquid density phantom was proposed. The precision of the method was demonstrated through a practical test example. The suggestion of modifying the current standards of ICT performance test was proposed.