An experimental study on the resistance characteristics of a hollow tetrahedron siltation promotion embankment is carried out，and the experimental results are compared with those of experiment on traditional siltation promotion embankment which is composed of riprap and armor block. The results show that：Firstly，when flow Reynolds number is small enough to bring about the non-submerged state of siltation promotion embankment，the resistance coefficient can be described using two broken lines under the same flow Reynolds number，the turning points of which are in accordance with the critical submerged criterion. With the increase of flow Reynolds number，the slopes of two broken lines get closer. Secondly，when the flow Reynolds number is too large to reach the non-submerged state，the resistance coefficient can be described using the single line alone under the same flow Reynolds number. Thirdly，the method of calculating the resistance coefficient is proposed which is also suitable for the normal permeable embankment.