It is reported that an acousto-optic programmable dispersive fiber (AOPDF) is applied to an ultrashort pulse in the CPA laser system. The AOPDF is based on a collinear acousto-optic interaction· The acoustic frequency is a variable function of time and provides control over the group delay of the diffracted optical pulse. Simultaneously, the spectral amplitude of the diffracted optical pulse is driven by the acoustic signal's intensity. The AOPDF permits precompensation for gain narrowing through amplitude shaping before amplification. The spectra of the amplified pulse keeps sufficient width after compression, and the ultra-short pulse can be obtained.