According to the principle of triple-frequency carrier phase combination and considering the influence of ionospheric delay on combined observation,this paper selects three linearly independent sets of coefficients of combined observation to calculate ionospheric residuals between epochs and correct the wide lane observation,the sum of coefficients of wide lane observation is a nonzero value.Then based on the combined observation of reparation to calculate cycle-slip integer value,and repair the cycle slip.By using BeiDou triple-frequency observation data,the experiment shows that proposed method can effectively detect and repair cycle-slips of BeiDou triple-frequency observation in real time.