Moisture existing in natural gas will form hydrate in certain conditions and hydrate will block pipeline and equipment. If natural gas contains C0₂ and H₂S, moisture in natural gas will form acid liquor and corrode pipeline and equipment. Therefore, it is necessary to conduct dehydration treatment before export. Compared are effects of DRIZO dehydration proeess with traditional triethylene glycol, applied is the software HYSYS for simulating two dehydration processes. Under certain gas flow(20°C, 101.325kPa), through changing absorber plate number and circulation volume and type of azeotropic agent, studied are factors affecting DRIZO dehydration process. It is found through calculation that water content in treated gas will meet relative requirements for pipeline transportation if natural gas processing capacity is 750 x 10⁴m³/d, absorption tower operating pressure is 11.7MPa, triethylene glycol barren solution circulation volume is 4.5 m³/h and mass flow rate of n-heptane as azeotropic agent is 5 kg/h. Isooctane and n-heptane are selected as azeotropic agent respectively for simulation, water content and dew point of dry gas after dehydration are the lowest. The research results show that DRIZO dehydration process has such advantages as high dehydration efficiency and less BTEX emission and its dehydration effect is far better than traditional triethylene glycol dehydration process.