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This paper proposed a fast pre-processing algorithm of GLONASS based bistatic synthetic aperture radar. GLONASS-BSAR is a kind of bistatic SAR system that GLONASS is the transmitter, while the receiver can be mounted anywhere, such as satellite, aircraft, vehicle or even fixed on the ground. Such a system benefits from low cost, good safety and multi-perspective. However, as such a system is a non-cooperative bistatic radar system, where the time, frequency and phase terms are not correlated between transmitter and receiver. In addition, as the transmitter employed in such radar system is middle orbit satellite, the SNR of the received signal is extremely low, bring difficulty to subsequent signal processing. As such, the article deals with the pre-processing issue of GLONASS-BSAR, aimed at achieving synchronization of such radar system. By extracting time history, frequency history and phase history, the proposed algorithm removed the time offset and phase offset. The experiments demonstrate that such an algorithm is able to achieve signal correlation from accuracy perspective and low computational complexity.