Guiding by sutra stratigraphic sequence theory of Vail, used the methods of well date of border upon and seismic date of deepwater area validated one another, and carved Lingshui Formation up to four third class sequences of SⅠ, SⅡ, SⅢ and SⅣ. Then founded the three-dimensional isochronous stratigraphic sequence trellis of Lingshui Formation in the deepwater area in Qiongdongnan Basin. Detailedly studied the pathway systems of Lingshui Formation in deepwater area in Qiongdongnan Basin. Then plotted out the pathway systems to three types of reservoir, unconformity surface and fault. Used the index of carried essential and space configuration, summarized the mode of pathway systems to nine types, and combined the temperature and pressure data and fluid potential and hydrocarbon source rock of the basin, summed up two kind of hydrocarbon accumulation pattern of rift valley and half rift valley. Then it forecasted the favorableness prospecting area of Lingshui Formation in deepwater area in Qiongdongnan Basin on the base of preponderant pathway systems evaluation.