Based on fiber optic rotary joint applications and its technical character istics in axial rotation optical communication system,a multichannel broadband fiber optic rota ry joint is proposed by using the Dove prism and fiber collimator.By analyzing the optical path in multichannel broadband fiber optic rotary joint,the different output signal off sets are obtained when the transmission wavelengths are 850nm,1310nm and 1550nm,respectively.So the Dove prism structure parameters and fiber collimator optical path can be designed to obtain the optimal broa dband coupling efficiency. The experimental results show that the maximum insertion loss of the multichanne l broadband fiber optic rotary joint is 4.7dB in wavelength range of 850－1550nm,and the return loss is 43.78dB.The maximum variation of insertion loss is 2.0dB in the temperature range of －40－70℃.The experime ntal results on digital video multiplexing in 1.32Gbit/s system have demonstrated that the frame loss rate is 0,and the transmission index of Ethernet and video is suitable for the requirements of the actual signals.