Integrality management of pipeline system is involved in design， construction， operation and so on. Design is the first step in the whole service life of pipeline system， so it is important that integrality concept is considered adequately in design period. Corrosion is a kind of hazard factors relative to time and it will run through the whole operation stage of pipeline system. For gathering and transportation pipeline system in H2S/CO2 gas field， corrosion issues will be more prominent and integrality management of pipeline system will be seriously effected by corrosion. Therefore， it is critical to select materials with very high corrosion resistance in pipeline system design period. In view of H2S/CO2 gas field development conditions， introduced are considerations in material selection during design period， corrosion risk assessment methods and corrosion control measures， which will provide a reference for pipeline system design based on corrosion risk control.