The properties of multimode tapered fiber end are studied in this paper. Based on light ray theory the transmission property of the tapered fiber end on different tapered angle is analyzed. The tapered end aperture angle versus the tapered angle and the tapered end radiation angle versus the tapered angle are obtained through the analysis. Finally a best design for coupling has been suggested. In the experiment,according to the theory analysis tapered fibers of different angle are fabricated by means of melting and pulling the end of optical fiber. The correctness of the theory is vadicated through the experiments.