Positron has various unique properties, e.g., positive charge, annihilation with electrons, emission of annihilation gamma ray, positronium formation, etc. These unique properties provide us with new information on surface and subsurface regions. In recent years, generation techniques of intense slow-positron beams have been developed and those beams have been applied to various surface studies. In this article, we briefly introduce slow-positron generation techniques and measurement techniques for surface studies.