Timing synchronization is one of the key techniques for Bistatic Synthetic Aperture Radar (BiSAR). This paper addresses the timing synchronization methods for BiSAR systems. One-way timing configuration is proposed first, which is based on direct spread spectrum sequence acquisition and tracking techniques. The synchronization performance is analysis and a enhanced DLL method for fine timing alignment is studied. Considering additional information about transmitter and receiver distance is necessary, an alternative method is put forward which uses two-way PN links. At least the same timing performance will be gained using this configuration.