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On-orbit absolute radiometric calibration is an important prerequisite for the quantitative applications of optical remote sensing satellite data. Due to complicated transfer chain of radiometric benchmark which is hard to be realized, and traditional field calibration (which takes at-ground measured target characteristics as a radiometric benchmark) inevitably may be affected by uncertainty factors such as scale effect, atmospheric condition and space environment perturbation, up to this day, the accuracy, consistency and traceability of on-orbit radiometric calibration are still difficulties to be solved in the world. To break through these bottleneck problems, we can make use of the "calibration benchmark satellite" to carry spaceborne radiometric benchmark sensors, and transfer their high-accuracy radiometric measurement values to other operational optical remote sensing satellites by the way of synchronously observing the same at-ground targets/scenes. Through precisely assessing uncertainties introduced in various steps in the whole transfer chain, the high consistency and traceability among different satellite remote sensing products could be achieved. In this paper, starting with technical requirements of on-orbit radiometric calibration for optical remote sensing satellites, the authors overviewed and described those developing processes and technical challenges related to some common methods for on-orbit radiometric calibration, such as on-board calibration, field calibration, cross-calibration and lunar-based calibration. Furthermore, currently most advanced calibration technology - space-borne radiometric benchmark transfer calibration, was also illustrated in this paper. In this advanced calibration scheme, radiometric benchmark sources traceable to SI are installed in a small number of benchmark satellites, then consistent high-accuracy on-board radiometric benchmarks can be transferred to multi-series of operational satellites, by way of cross-calibration based on synchronous observation of earth/moon scenes. This calibration scheme is expected to extensively improve international technical level of calibration, and also can guarantee high consistent and high stable data quality for multi-source satellite data.