In this paper basic principle of range-Doppler imaging in inverse synthetic aperture radar (ISAR) is analyzed. Simulating experiments of ISAR imaging on far-distant rotating multi-point targets are finished. The data films of ISAR in rectangular and polar coordinate formats are generated by microcomputer. Two-dimensional image with high- resolution are obtained by optical processing technology. Possible motion errors are discussed in the paper. Compensating methods and experimental results for some motion errors are given. Finally, feasibility of optoelectronic hybrid real-time processing for ISAR data is investigated.