And among the causes of leakage, it s the "Third Party Damage on Pipeline" that mostly happens.

The types of the third-party damage of offshore pipelines' failure were pointed out,the reasons were analyzed,and corresponding measures were presented.

The third-party damage is the main factor of the failure of buried pipe for city gas,which includes minimum depth of cover,humans activity level,aboveground facilities,buried establishment around pipe,public education,right-of-way condition,management and maintenance level and so on.

Based on the explanation of the form of third party damage to oil and gas pipelines and its serous consequences,the analy-sis is given to the cause of third party damage to pipelines.

Complex and extraordinary random,and very difficult to forecast and control is one of the major factors for oil and gas pipeline s third party damage.

Causes and hazards on the pipeline damaged by third party are analyzed,risk factors of this damage to pipelines are determined and pipeline sectioning principle suitable for assessment on third party damage of pipeline is developed.

Then the paper establishes the model of third-party channels based on precise marketing,and joint analysis of the advantage of precision marketing from the three angles of planners,collaborators and consumer is given.