Indoor location technologies is the hot research topic recently. This paper studies the current various indoor location technologies including AGPS, Infrared, Ultrasonic, UWB, WaveLAN, RFID and Computer visual. It analyzes their working mechanism, locating accuracy suitability and their advantages and disadvantages. The accuracy of Infrared and Ultrasonic is cm scale, location system based RFID technology which uses RSSI method rapidly developed recently, and the accuracy of combination HF RFID and LF RFID is reached 1m level.