To clarify the surface alignment mechanism of liquid crystal in detail, we have tried a simplified rubbing by using only one fiber, which we call "one-fiber-rubbing", and observed the microgroove. Then, we compared the curvature of microgroove structure observed by atomic force microscope (AFM) and friction force microscope (FFM) with that of the fiber observed by scanning erectron microscope (SEM). From the result, we confirmed that they agreed well with each other. Therefore, we concluded that the microgroove is formed by micro-structure of the fiber edge. We also measured anchoring strength of the rubbed polymer surfaces with various pitch of the microgroove. From the result, we found that the anchoring strength is almost proprotional to the ratio of the total area of each microgroove in unit area.