Melbourne-Wübbena(MW) combination method cannot detect the same cycle slip in the same epoch of L1 and L2 carriers, and the cycle slip separation cannot be realized after the sounding of the cycle. An improved method of cycle slip detection based on jointing Doppler and MW combination is proposed. The Doppler integral is applied to detect and repair the cycle slip of single frequency point. Combining the traditional MW method and Doppler integral method, an improved model is established, and the cycle slips generated by L1 and L2 carrier phases are calculated and separated. Verification and analysis are carried out by the measured data, and the detection results of the improved methods under three different conditions are compared. Experiments show that the new algorithm can not only detect and separate the cycle slip combinations in L1 and L2 carrier phases accurately, but also accurately detect the location and the values of cycle slips; and it can detect and repair the cycle slips for more than 1 cycle, which effectively improves the accuracy and reliability of the MW combination algorithm.