The self-developed swept source optical coherence tomography (SS-OCT) system is reported. Based on a high speed scanning laser source, the system realizes high speed A-scan rate of 20 kHz from 500 Hz A-scan rate of time-domain OCT. To realize linear calibration of wave number space, a pre-calibration method based on the SS-OCT system is used. Because of the non-Gaussian spectrum output of the swept source, a method based on window function is used for spectrum reshaping in the spectrum domain. To eliminate the direct current（DC） and auto-correlation term in the interference spectrum, the common-rejection of balanced detection, and a software method of subtract the mean value were used. The axial and lateral resolution of the SS-OCT system achieves 14 μm and 12 μm, respectively. The ranging depth of the SS-OCT achieves 3.9 mm. High speed optical coherence tomography images of finger-pad organism using the SS-OCT system wera obtained.