Abstract: Ten rhesus monkeys (Macaco, mulatta) are exposed to 16Ghypergravity force, the respiratory rate, EEGare continuously recorded. Under the action of 16G, the respiratory rate of all the monkeys increases first, then slowed down, and at the end of the centrifugation, the respiration almost ceased. The heart rate showed an initial increase (70% monkeys), then a gradual decrease, sometimes occurs arrhythmia, heart block etc. The brain waves appeared mainly to be the "delta" waves with high amplitude and low frequency. Then the wave amplitude fell down gradually and accompanied by the appearance of 4-6 c/sec. "theta" waves with small amplitude. Not until the EEGdisappeared did stop the centrifugation.