With the development of photonic integrated circuits and all-optical networks, semiconductor ring lasers (SRL) based on the structure of ring resonator have received increasing attention and have been one of the focuses in the field of integrated optics in recent years. The design, fabrication and test of a semiconductor ring laser with two coupling bus waveguide are reported in this paper. The width of the ring resonator is 3.4 μm, the ring radius is 349 μm, the gap between the ring resonator and the bus waveguides is 1.0 μm, the threshold current of the (SRL) is 36 mA, the free spectral range FSR is 0.33 nm, and the center lasing wavelength is 1566.66 nm when injected current is 61 mA. Coupling an optical fiber to an end of the bus waveguide, the output optical power reaches to 40 μW. Semiconductor ring laser’s bidirectional operation state, unidirectional bistability operation and unstable alternating oscillation operation state are observed through the P-I characteristic plot. At last, the spectral characteristics of lasing and non-lasing are analyzed when the ring laser operates in unidirectional bistable region.