Fluid activity in the deep water sedimentary unit of the high sinuous submarine channels, submarine canyons are the focus nowadays. This study uses high resolution seismic data, combined with the geomorphologic features to discuss the sedimentary characteristics and fluid mechanism in the middle segment of the Taiwan Canyon. There is an inner levee located in the middle Taiwan Canyon. The internal structure of this inner levee is characterized by obviously onlap and lateral accretion. In meandering rivers and high sinuous submarine channels, due to the change of geomorphologic or the decrease of slope, the sediment started to unload. When it went through the bend, with the action of centrifugal force, massive sediment accumulated at the convex bank. Non similar with the rivers and high sinuous submarine channels, the inner levee is located in the straight segment of the middle canyon, where has no geomorphologic condition to form the point bars. The inner levee can be interpreted as the product of interaction between down and along slope processes.