Subsea pipe strength will be reduced by corrosion in operation phase,it is necessary to estimate the remaining strength of corrosion pipeline in order to forecast the damage level of corrosion pipeline.Through calculation analysis,the two assessment methods for corrosion subsea pipeline were studied,namely calibrated safety factor method and allowable stress approach.The results show that there is a relative defect depth(d/t)0 existed when inspection accuracy is not 0 and the two methods has the same assessment result at(d/t)0.Also,the improvement of inspection accuracy and confidence level for inspection equipment will be benefit to assess the remaining strength of corrosion pipeline more objectively.