On the basis of the concept of Spectral Domain Optical Coherence Tomography (SDOCT),a fiber type SDOCT system which is easy to integration was developed. The system shows its longitudinal resolution in 7.3 μm, lateral resolution in 9.5 μm and offers the imaging depth to be 3.14 mm in air. The system obtains the sample deeply by a interferometer, which achieves the dada collection fast. The organizational features of salivary glands were researched by the above system, and the OCT images for the parotid glands were compared with that of the pathological section. Results show that the system proposed can provide a direction for the early diagnosis and the non-harmful examination of the oral cavity tissue.