Along with the development of mobile communications and wireless network technology, positioning services are more and more important and have become the focus of research. the most common technology which supports outdoor positioning services is global positioning system (GPS). but GPS has been subjected to some restriction in complex environments, while WLAN (wireless local area network) has matured gradually in recent years, so positioning technique based on WLAN can assist GPS. in this paper, we describe two positioning technuques on WLAN : triangulation and fingerprinting. then the experiment for positioning is presented. finally, we discuss the differences between those two WLAN positioning method, we find that fingerprinting has higher accuracy then triangulation, but more complex.