In a chirped pulse amplification (CPA) laser facility, the output capability can be increased if the pulse can be stretched wider. Adopting the design of “single-grating and single-lens”, a 8-pass laser pulse stretcher is developed, and analytical formulae about the design are presented, with which the stretcher has been optimized to some extend. With the stretcher which has been developed, a pulse of 93 fs is stretched to 4.35 ns. Additionally, by controlling the reflection of the mirror in the focal plate (or controlling transmission of an optical component before the mirror), a shaped pulse can be obtained, which is similar to the pulse gotten from an acoustic-optic programmable dispersion filter (AOPDF).