Based on the understanding to regional search features,a viewpoint is put forward that buoy array deploying,buoy array monitoring and their relationship should be taken into integrated consideration for anti-submarine patrol aircraft to search submarine by using sonobuoy.Further more,two types,totally three kinds of methods are put forward for the submarine search based on the analysis to sonobuoy regional search situation.This paper is focused on asynchronous search of deploying and monitoring.According to this search method,the concept of standard buoy array is put forward.The search efficiency calculation models and the buoy distribution models are conducted.The example of regional search using this searching method is given.The sonobuoy regional search situation for anti-submarine patrol aircraft to search submarine is analyzed after the sonobuoys get touch with the submarine,and the action methods after contaction is given.The basic principle of search method selection and the planning steps of regional search for anti-submarine patrol aircraft using sonobuoy are also given.