Three different models for the Q-switching of the solid state lasers have been studied and discussed. These models are See, Ifflander, and Kochner respectively. The validity of the See model is seen to be reasonably applicable for the case of the Q-switched and non Q-switched Nd:YAG lasers. Both conventional pumping of neodymium by flashlamps and nonconventional pumping by laser diodes are considered for verification of the validity of the model. The results are shown to be a good agreement with available experimental data. The investigation of the Kochner model, which is applicable to CW Q-Switch, leads us to the conclusion that the model given by Kochner can be considered as convenient and simple model for the case of CW Q-switching laser. Using the Ifflander model, the energy as a function of repetition rate are studied and discussed in this analysis. The developed software for the Q-switched laser parameters can be considered as guide for laser designers and can be further developed to include the Optical, Mechanical, and Electrical designs. Further investigations of the present models are suggested as a future Tisapphire laser.