Synthetic polymer oxy—enriching membrane has selective permeability for gases and under pressure,it can obtain enriched—oxygen air,provided for patient, from atmosphere.In this paper,a small size equiqment manufactured by self-made hollow-fiber oxy-enriching membrane module,its working principle,operating con- ditions and its working state under various operating conditions were discussed.Fina lly,the clinical practice of the epuipment was presented.