目的　研究海上饱和潜水对潜水员肺呼吸功能的影响。方法　在海上氦氧 140 m饱和 -16 6 m巡回潜水实验中 ,检测 8名潜水员在各个不同深度条件下的肺功能 ,分析肺功能与呼吸气体密度的关系。结果　呼吸气体密度和导热系数的变化对肺静态容积指标值未产生明显影响 ,在所有潜水阶段均保持在正常参考值范围 ;肺动态容积指标最大通气量 (MVV)随深度增加而显著降低 (P<0 .0 1) ,饱和深度 (140 m )时降低 41% (P<0 .0 1) ,MVV与呼吸气体密度的平方成反比 ;在不同深度下 ,呼吸频率保持相对稳定 ;其他动态肺容积指标与 MVV变化趋向一致 ;V75、V50 、V2 5三者斜率下降 ,其中 V75最大 ,V50次之 ,V2 5最小。减压过程中 ,所有这些改变均随着暴露压力的降低逐渐恢复正常。结论　饱和潜水过程中 ,潜水员静态肺功能无明显变化。高压氦氧混合气对潜水员肺呼吸功能存在一定影响 ,应引起重视。但所有这些改变均属可逆性改变 Objective To study the influence of sea saturated diving on the lung function of divers. Methods During the diving test of helium-oxygen 140 m saturation and -16 6 m in sea, the lung function of 8 divers at different depths was tested and the relationship between lung function and respiratory gas density was analyzed. Results The change of respiratory gas density and thermal conductivity had no significant effect on the index value of pulmonary static volume, and remained at the normal reference range at all diving stages. The MVV of pulmonary dynamic volume index decreased significantly with increasing depth (P <0.01), and 41% (P <0.01) at saturation depth (140 m). The MVV was inversely proportional to the square of the respiratory gas density. At different depths, the respiratory rate remained relatively stable. Other dynamic lungs Volumetric indicators and MVV trend of change; V  75, V  50, V  25 slope decreased, of which V  75 maximum, V  50 times, V  25 minimum. During decompression, all these changes gradually returned to normal as the exposure pressure decreased. Conclusion During the process of saturated diving, the diver’s static lung function did not change significantly. High-pressure helium-oxygen mixture of divers lung function has some impact, should pay attention. But all these changes are reversible changes