The error measurement for soliton communication is successfully realized. For 2.5 Gbit/s solitons transmitted over 52 km, there is no error within two hours. The key techniques——the generation of ultra-short optical pulses, external modulator with high speed, amplification for electrical and optical signals, the synchronization for soliton pulses and modulation signal and dispersion allocation for normal and abnormal dispersion fibers are introduced and analyzed. The experimental phenomena are theoretically analyzed.