A study of the maximal expiratory flow volume (MEFV) curve, chord time constant (tau ch), specific time constant (S tau) and partial mean transit time (MTTp) in 104 soldiers stationed in Chengdu was made by "point-measured method". Results showed that in comparison with the predicted value, the flow at high lung volume, V75 was increased; tau ch75, S tau 75 and MTT20-30% at the corresponding lung volume were shortened; V25 and FEF75-85% at the low lung volume were lowered; and V25, S tau 25, MTT70-80% at the same volume were prolonged. Five normal sedentary workers received a FVC training for a period of one month. The result showed that FVC, FEV1 and V75 were significantly increased, and that the changes just corresponded to those in trained soldiers. All the facts suggested that the respiratory muscles in soldiers were trained and their activities were strengthened by the military training. The changes in respiratory mechanics just after exercise show that the increased V75, enlarged tidal volume and quickened tidal flow lead to the deepening and quickening of respiration and increasing of ventilation. Resembling exercise, these changes of military training are available for oxygen requirement during the training.