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, and the action methods after contacting are given.The concept of standard buoy array is put forward corresponding to each search method, and search efficiency calculation models are established.The planning steps of submarine regional search for anti-submarine patrol aircraft are also given.The two methods of the first type of search method, synchronous search of deploying and monitoring, are mainly discussed, and the examples of regional search using the two methods are given.