Abstract: The labyrinth device which was created by lst Group of the Ecological Lab.,Institute of Zoology, Academia Sinica is based on the smelling frequency of tested mouse to screen the mouse lure agent. We made an improvement and added the function of smelling duration to above device. A determination to compare the mouse-luring capacity among 30 lure agents was undertak-en, It was considered that the comprehensive analysis combining smelling duration with smelling frequeney to evaluate the capacity of mouse-luring agent is more close to the real situation.