Several groups of pitch adjusting tests are needed to obtain the glider movement characteristics. The more data for analysis, the calculation results more accurate. The first method is easy to operate, but has great randomness especially when the environment changes. It is not suitable for application in the complex underwater environment. The second method is more scientific, reasonable and applied widely. It usually involves system dynamics model, and ultimately derive the equilibrium conditions of the system. This process is complicated, and there is not a universal method.