The difficulty of the swept laser source based on time-domain dispers ion stretching technique lies in the dispersion matching problem in the cavity.T his paper proposes a method to solve the mismatch between the positive and negat ive dispersion in the laser cavity,analyzes their working principle,and obtained stabile operation of the swept laser source.By measuring the spectral and time -domain characteristics,it is further verified that the laser was indeed under wavelength swept operation.It has a center wavelength of 1555nm,a sweeping wave length range of 16nm,and a sweep rate of 6.17MHz.The swept source could find p otential application in SS-OCT imaging and fiber sensing system.