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The impact of satellite motion on two-way satellite time and frequency transfer (TWSTFT) is analysed. Due to the two distances from two stations to the satellite being different, the non-reciprocal paths are produced, which impact the accuracy of TWSTFT. Choosing a satellite for which both elevations are about the same can minimise the effect, or offsetting the transmission time can eliminate this. In addition, due to the Earth's rotation and the finite signal velocity the non-reciprocal paths are also produced, and the error mainly results from the aviation of the satellite longitude and altitude.