Abstract: According to the design data of wet gas reinjection engineering in Zananor oil field of the Republic of Kazakhstan, particular sour gas which contains oxygen has been treated by molecular sieve dehydration unit. It introduces the main process characteristics, the selection of equipments and materials, the plant layout, main measurements of energy conservation and energy consume, etc. It gives reference to similar design of dehydration unit which using molecular sieve as adsorbent to treat particular sour gas which contains oxygen.