A method of forming a fin-shaped structure includes the following steps. A substrate having at least a fin structure thereon is provided. A liner is formed on sidewalls of the fin structure. An oxide layer is formed between the fin structure and the substrate. The fin structure is removed until a bottom layer of the fin structure is reserved, to form a recess between the liner. A buffer epitaxial layer and an epitaxial layer are sequentially formed in the recess. A top part of the liner is removed until sidewalls of the epitaxial layer are exposed. Moreover, a fin-shaped structure formed by said method is also provided.