Acousto-optic programmable filter (AOPDF) as an amplitude and phase modulator is introduced It can compensate in real time for dispersion and precompensate for gain narrowing in femtosecond chirp-pulse amplifier (CPA). Numerical simulation shows the characteristic of the AOPDF in the femtosecond pulse compression which utilizes the LiNb03 crystal as an acousto-optic crystal.