An optical fiber bi-directional chaos secure communication system is proposed and a model of optical fiber bi-directional chaos communication is presented by coupling the all-light chaos coupling-feedback synchronous system with the injection-light semiconductor lasers and optical fiber channel.The synchronization is numerically achieved in long-haul optical fiber propagation and the system synchronous error is in detail analyzed.Chaotic laser synchronization is mainly limited by cross-phase modulation in the fiber and the propagation nonlinear phase shift is educed.Chaos analog secure communication with a sinusoidal modulation signal of 0.5GHz

chaos digital secure communication with a digital modulation signal of 0.4Gbit/s and 20Gbit/s rates and chaos shift keying secure communication with rate 0.05Gbit/s are numerically simulated

respectively.Relationship between the bit rate and the synchronous error is numerically calculated in optical fiber chaos digital secure communications.The decoding performance and the modulation bandwidth of the system are also analyzed in detail. The system shows the good abilities of robust security and high rate communications. So it could be realized for long-haul bi-directional optical fiber chaotic secure communications.