The time model of Beidou satellite clocks is analyzed. The general relations of satellite clocks with the system time are studied.\r\nThe error sources of two-way radio time transfer between satellites and uplink stations are analyzed.The uncertainty of type A is\r\nabout 0.3 ns in Beidou system. All the satellite clocks in orbit of Beidou satellite navigation system are evaluated by the clock offsets\r\nobserved by the two-way radio time transfer.The frequency stabilities at a sample time of 10000 s and 1 day for all the satellite clocks\r\nare better than 1.0 Ã?â?? 10-13. It means that the performance of Beidou satellite clocks in orbit is consistent with the ground test, and\r\nthe results in orbit are a little better than those in ground vacuum.
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