Currently, simulation technique for optimization analysis or simulation-optimization technique becomes an interestingtool in operation research. According to some limitations of mathematical model formulating using linear programming togetherwith an inability of simulation for optimization, simulation - optimization technique was firstly developed and continuouslyimproved, until it is widely applied for solving many real application problems. In this paper, the objective is to present theevolution and principle of simulation - optimization technique, some examples of simulation - optimization techniqueapplication, classification of the technique, and computer software for simulation – optimization