The dependencies of the line-of-sight velocities of the photospheric material motion on height are given for four moments of the observation of the gradual phase of a weak flare and for a large two-ribbon flare at different stages of its evolution: 30 minutes before the flare, in the impulsive and gradual phases. A downward motion of the photospheric material was observed in the gradual phase of the weak flare. Possibly, the downflow was a response to the chromospheric condensation. A new magnetic flux emerge occurred in the large flare. The velocity of the upward motion of the photospheric material was equal to 1—4 km/s.