By the limitation of the testing model and balance structure, wind tunnel balance's precision and accuracy is lower, and it's hard to measure axial force of the control flap in high wind tunnel testing, so the quality of the testing data can be influenced. For solving this question, multi-beam symmetrical structure and a new combined bridge scheme had been designed, finally, a novel four components plate type hinge moment balance had been completed, which can measure axial force efficacious and was used in certain airplane model control flap hinge moment testing successfully. The calibration results and the test data shows that the balance's precision and the accuracy is better than normal three components plate type hinge moment balance, use such type of balance can increase the quality of the testing data efficiently which has good application value.