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This paper proposed a method for obtaining small-bias differential phase delay by using the same-beam VLBI (SBI) technique and by observing quasar to correct the different channels equipment delays.We confirmed the effectiveness of the method by using CE-2 X-band VLBI observation data and SBI test data obtained at Shanghai,Kunming and Urumqi stations.These results show that the differential phase delay can be obtained with a random error of ps and a system error of 0.5 ns,the relative position of the rover may be determined with an error of tens of meters.