Based on the previous research and the latest geological and geophysical data, the spatial distribution characteristics as well as the deformation characteristics of tectonic units on both sides of the tectonic boundary are systematically analyzed in this paper we propose that the boundary begins from the east side of Taiwan coast plain in the northeastern South China Sea, then extends southward along the Manila Trench, through the thrust fault zone of Mindoro island, joints to the Negros Trench at the east edge of Sulu Sea, then the boundary goes through the thrust fault zone of Zamboanga and connects with the Cotabato Trench. The trench-arc-basin system of Southeast Asia is one of the most developed areas in the world, and there is a subduction-collision boundary which is still active nowadays between the Philippine Arc and the Sunda margin.
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