A power generating system being disposed, in use, in a flow field, wherein streams of the flow field flow along a main fluid flow direction , the power generating system comprises: a supporting device, including at least one supporting body having a stream-facing region , a side-stream region , and a vortex region , wherein the stream-facing region is defined as a surface facing the streams flowing along the main fluid flow direction, the side-stream region is defined as a surface lateral to the streams flowing along the main fluid flow direction, and the vortex region is defined as a surface facing away from the streams flowing along the main fluid flow direction; a down flow is formed in the stream-facing region when the streams flow through the supporting body and contact the stream-facing region ; a lateral flow is formed in the side-stream region when the streams flow through the side-stream region , and a vortex flow is formed in the vortex region ; a power generating device being disposed on the supporting device, the power generating device comprising a plurality of power generating units (31, 32, or 33), wherein the power generating units (31, 32, or 33) are disposed on the stream-facing region , the side-stream region , and on the vortex region ; and a diversion trench formed on the side-stream region for the power generating units on the side-stream region disposed therein, the diversion trench diverting the streams into the lateral flow and guiding the lateral flow to drive the power generating units ; wherein the power generating unit (31, 32, or 33) is selected from a group consisting of a turbine generator and a vibration generator, and at least one of the power generating units disposed on the stream-facing region is driven to generate power by the down flow . a supporting device, including at least one supporting body having a stream-facing region , a side-stream region , and a vortex region , wherein the stream-facing region is defined as a surface facing the streams flowing along the main fluid flow direction, the side-stream region is defined as a surface lateral to the streams flowing along the main fluid flow direction, and the vortex region is defined as a surface facing away from the streams flowing along the main fluid flow direction; a down flow is formed in the stream-facing region when the streams flow through the supporting body and contact the stream-facing region ; a lateral flow is formed in the side-stream region when the streams flow through the side-stream region , and a vortex flow is formed in the vortex region ; a power generating device being disposed on the supporting device, the power generating device comprising a plurality of power generating units (31, 32, or 33), wherein the power generating units (31, 32, or 33) are disposed on the stream-facing region , the side-stream region , and on the vortex region ; and a diversion trench formed on the side-stream region for the power generating units on the side-stream region disposed therein, the diversion trench diverting the streams into the lateral flow and guiding the lateral flow to drive the power generating units ; wherein the power generating unit (31, 32, or 33) is selected from a group consisting of a turbine generator and a vibration generator, and at least one of the power generating units disposed on the stream-facing region is driven to generate power by the down flow . <EOS>