Abstract: Based onexperiences gained from drop-model tests in high speed wind tunnel, several critical problems are summarized for the test technique. Those problems are significantly important, and have great effect on the test results. The problems are, respectively, the choice of scaling laws, accurate simulation of separation parameters, instantaneous impact force exerted on the store model at the time of wind tunnel starting, and data extraction. The principle to choose solving methods and operation procedures are provided for the four problems. A careful investigation is needed for the four critical problems before the wind tunnel test, which is helpful to insure high accuracy of the test results. Heavy Scaling can secure the correct path for the model, but it is hard to be applied. The Light Scaling is opposite to the Heavy Scaling, and is used much more commonly in wind tunnel drop-model test. However, corrections are needed for deficiency of vertical acceleration in the Light Scaling. The model ejector force is accomplished by using springs or air cylinders. The spring is easy to be operated, while its accuracy of simulation is lower than that of the air cylinder. When the wind tunnel starts up, the impingement of air current on the model always affects the operation or the result of the test. The experimental data are smoothed by a function of time, and then differentiated to acquire aerodynamic coefficients. The applied fields are introduced for drop-model testing technique in high speed wind tunnel. These fields can be classified as jettisons of airborne external stores or internal missile separation, submunition disperse or weights disperse, and shroud separation or cover separation. The specific test technique and its characteristic are analysed with respect to the four critical problems, including the choice of scaling laws, the effect of gravitational acceleration deficiency on the test results for the Light Mach Scaling, and the choice of simulation methods of separation parameters. The specific test images and curves, regarding displacement, velocity and acceleration, are present for different high speed wind tunnel drop-model tests.