Thoracoabdominal injury by a crowd of people is serious problem for crowd accident. To reduce the number of victims, it is important to make the criteria of thoracoabdominal injury clear. Therefore, the purpose of this research is to develop animal experiment model for breakthrough the criteria of thoracoabdominal injury. This paper studies on the experiment in which the compression load is set once and twice heavier than the weight of experimental subject. As a result, with increase in compression load, it was found that tidal volume reduced and respiratory rate increased.