The present invention provides a supporting member and a supporting member assembly including the same to be implanted into or between a subject's bones, and a template plug and a tamper corresponding to the supporting member. The supporting member comprises a main body; a first connecting portion and a second connecting portion formed on the upper and lower sides of the main body respectively and forming a dovetail joint with each other; and a guiding structure formed at a side of the main body and including guiding holes as well as a buffer groove for mating with an external template plug. The supporting members of the invention can be sequentially implanted and connected into a bone or between two connected bones, and improve the defect of the conventional one-size giant implants injuring the surrounding nerves.