The temporal shape of laser pulse is very important for most physical experiments at the SGII facility. For monochrome laser, a general approach is to calculate the injected pulse shape by using gain-fluence curve (GFC). But it doesn′t work well under the condition of high fluence or especially complex pulse shape. For different output fluences, a new hybrid algorithm, based on GFC and intelligent algorithm, is applied to solve the inversion problem of pulse shape at the SGII facility. The calculation accuracy is only decided by the number of sampling points in theory. Hybrid algorithm is proved to be robust, high precision and rapid convergent by numerical calculation.