Abstract: This paper presents a new non-sense WLAN authentication scheme.By making use of the characteristics that the RSSI value is very difficult to be forged,The scheme adopts the improved K-means clustering algorithm to reduce the influence of environmental factors on wireless signal RSSI value and constructs the Radio Map based on RSSI.the scheme examines and authenticates user's access to WLAN by adopting RSSI location fingerprint matching technology.Through testing in the environment of IEEE802.11 g,it shows that the scheme has the advantage of strong anti-jamming capability and high rate of successful authentication.