Attack model BBFPAN based on both-branch fuzzy decision-making and fuzzy Petri net has some drawback such as can not depicting the network attacks pictorially.Based on set pair analysis,a both-branch set pair analysis model is put forward to the attack model BBFPAN.The multilayer set pair of attack model BBFPAN has been discovered in the both-branch set pair analysis model.The relationship between the factors of the attack model BBFPAN and the network attack can be depicted as the connection degree.The relative degree of decision weight successes to attack and defense can be determined through the close-degree.The basic step of both-branch set pair analysis model on attack model BBFPAN is also proposed which can help the attack model reasoning with the Set Pair Analysis.