Abstract: Considering the problems that digital beam-forming (DBF) weight coefficients are hard to be calculated precisely and the weighting operation is complex on scan-on-receive (SCORE) of analog-to-digital (AD) sample data, this paper proposed an adaptive algorithm on SCORE based on A/ D sample data. This algorithm can estimate DBF weight coefficients of multi-channels based on the data of the identical range bin, or firstly divide the multi-channels data into groups and time-variant weight them, then adaptively estimate the DBF weight coefficients of the grouped data, lastly multiply the multi-channels data by the estimated DBF weight coefficients and accumulate these data so as to complete SCORE process. Compared with other SCORE methods, the algorithm possesses merits of high-accuracy weight coefficients, weighting simple and light computation load, can be applied to the DBF-SAR system with long or short pulses, the effectiveness of the algorithm is confirmed by imaging results of the real echo data.