The theory and error estimation of the influence of ocean tide on the determination of satellite gravity recovery are described briefly. Using the ocean tide model of TPXO6, the effect of ocean tide on gravity determination is investigated and compared with the error of recovered gravity by GRACE. The result shows that M2 constituent of ocean tide contributes most and mainly to the potential coefficients of degrees below 40 and that the error of ocean tide also notably affects the gravity determination of low degrees. This result is adopted to reduce the tidal component in recovered gravity of low degrees and provides reference in relative studies.