In order to solve the problems of the difficult installation of 3D center of mass measurement, the paper introduces a method of measuring the quality of the finished product and the measurement system of the three dimensional center of mass. The system using new flip pack card of the object is completed 90 degree turn, based on the principle of moment balance, measured by a force sensor adopted is that the measured data, the computer complete calculation and analysis, and the system principle, measuring method and accuracy analysis. The test results show that the system can reduce the number of re hoisting of the measured object, and the measurement of the quality of the position of the measured object and the measurement of the three center of mass can be satisfied by the rotation of the system equipment.