Abstract: In this study, six experiments were made on 22 healthy male adults fora total of 36 times of simulated saturation diving. The result shows that thesimple reaction-time is usually prolonged when the nitrogen partial pressure isabove 2.7 ATA. The two-choice reaction time is obviously prolonged at thedepth between 50 and 70 meters. The ballbearing rate decreases obviouslyafter 60 meters. The effciency of the test to add between one-digit numberdecreases obviously after 70 meters. There is no significance for the memorytest within ten digits until the depth is 70 meters These results show thatunder nitrogen-oxygen saturation and air excursion beneath the depth of 70meters all the divers keep good intelligence and working ability.

Key words: NULL