In order to promote the application of BDS (BeiDou navigation satellite system), especially the BDS-3 to join TAI (international atomic time) calculation, BDS-3 common view time comparison was implemented by using the pseudo code measured data of BDS-3 new signal between National Time Service Center of Chinese Academy of Sciences and the Institute of Photonics and Electronics Academy of Sciences of the Czech Republic. The results show that the signal of multipath noise and signal-to-noise ratio of BDS-3 are less than those of BDS-2. Compared with the previous studies, the noise of common view time comparison based on new BDS-3(B1C & B2a) signal is much better than that of the BDS-2(B1I & B3I) compatible signal, which is broadcasted by the BDS-3 satellite, and the results are similar to those of GPS and Galileo, the standard deviation of the result based on BDS-3 signal is increased by more than 40% compared with BDS-2 signal. The noise of BDS-3 single common view is smaller than that of BDS-2, and frequency stability of result is increased by more than 10% relative to BDS-2. The experiment can provide research foundation for the BDS-3 application in the TAI calculation.