Owing to the existence of gain saturation and depletion, the temporal pulse shape experiences large deformations in the master oscillator power amplifier systems, resulting in large, deviation from that of the seed laser and thus an uncontrollable output shape. In order to obtain specific temporal shape in the output laser pulses, researchers have proposed the temporal pulse shaping technology in the master oscillator power amplifiers. Both the theoretical and the experimental studies are introduced to achieve proper temporal shaping in this paper. It is also pointed out that the pulse shaping can be useful in getting flexible, accurate, and extensive control over temporal features of laser pulses.