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Through numerical simulations,the energy harvesting performance of a heaving and pitching foil under gust conditions is investigated in this work.The wind gust is modelled with single frequency harmonic oscillation and there is a phase difference between the pulsating quantity of the gust and the pitching motion of the foil.To conduct numerical computations,the commercial code FLUENT together with dynamic mesh strategy is adopted.By comparing with the results from uniform flows,it is found that the energy harvesting efficiency under gust conditions can be different.When the phase angle is in the range of PI/2 and 3PI/2,the lift force induced by the leading edge vortex and the heaving motion of the foil are mostly in phase with each other.