Abstract: The real weapon cavity model is used in the hinge moment measurement test of the full scale internal weapon cavity door.It is not allowed to install the special hinge moment bal-ance on the weapon cavity door for measuring the hinge moment.Besides,it is not allowed to process holes on the weapon cavity door’s surface for measuring the hinge moment by pressure measurement.The hinge moment measurement method for the weapon cavity door is put for-ward:the simulation short beam and the loading device are specially designed to ensure consis-tency of the calibration state and the test state and to achieve the single-point loading and multi-point loading simultaneously;the strain gauge is sticked on the ear-flake of actuator,which is made of the half-bridge;before the weapon cavity door installation,varying force and moment are exerted on each ear-flake of the actuator independently to acquire the hinge moment formula by using superposition method and average method,and after the weapon cavity door installa-tion,varying force and moment are exerted on the ear-flake of the actuator at a single-point or multiple-points simultaneously to verify the hinge moment formula by using iterative method. The calibration of hinge moment is accomplished in this way.The hinge moment acting on the weapon cavity door is acquired in wind tunnel test.