ZH-XWT type tail suspension test video analysis system ZH-XWT type tail suspension test video analysis system in experimental animals by the tail so that it fixed animal head hanging down, animals struggling desperately trying to escape this environment they can not escape, thus providing an inescapable oppression environment, some time after the experiment, the animals recorded in the environment to produce a stationary state of despair during a series of arguments, the animals exhibited the typical "no state", reflecting the what is called "behavioral despair state" This behavior is similar to depression, despair model, but the vast majority of antidepressants sensitive, but its efficacy was significantly correlated with the clinical efficacy, it is widely used in anti- primary depression drugs.