Abstract: Development of the faultage controls the geometry conformation and sediment growth of the triphibian mutually depress basin, and it decides the growth characteristics of basin in different area, thus forming some special oil-gas conformation types. The mostly conformation of Bonan heave distribute in heave extremity, for example BZ26-2, BZ28-1and PL19-3 construction, but for the reasons of the difference of construction scheduled time and action, different area has different effection and its oil gas physics character exists great difference, all these are decided whether the action of default is connection or obstruction. To analyse the construction of Bonan heave, the distribution of oil gas conformation was found connected with two defaults. Combining with default characteristic of Bonan area,this paper discuss the default systemsinfection to different construction in Bonan heave.