This paper studied the self-designed testing instrument which could test the Bingham type ink flow characters according to the fluid dynamics characteristic of the Bingham fluid. The testing instrument took high-pressure gas as power source, and used the advanced sensor technology, virtual instrument technology and self-developed software. The testing instrument could achieve the signal of the fluid flow parameters, and then the data was automatically collected, filtered and preserved. The experimental results on this instrument showed that the flow characters of the Bingham type ink could be observed in the testing tube and the corresponding yield stress could be also achieved, it would provide the accurate testing data for the scientific research and the engineering practice.