A structure for optical fiber with single layer coating suitable for field termination process is provided, including a glass core, a cladding layer, and a permanent coating protective layer. The thickness of the permanent coating ranges preferably from about 4 um to 8 um, and remains on the optical fiber during the field termination process to provide protection to the optical fiber after the buffer layer is striped off. In addition, the optical fiber structure of the present invention still conforms to the specification of the standard optical fiber. The optical fiber of the structure according to the present invention can simplify the field termination process so that the quality efficiency of the deployment is improved.