Abstract: The chirp scaling(CS) algorithm for forward-looking bistatic synthetic aperture radar is proposed.Firstly,the imaging theory of forward-looking Bi-SAR is studied and its signal model is either constructed.Then the forward-looking Bi-SAR is degraded into the fixed receiver Bi-SAR by time domain linear range migration compensation,and the azimuth Doppler modulation rate change of the degenerated signals are analyzed;Based on these,the Bi-SAR chirp scaling algorithm is brought forward with the new match functions.Finally,the computer simulation verifies the validity of this approach.