Optional selection technique similar to The Ideal Solution (TOPSIS) is a multi-criterion decision Is the method of analysis. This was originally Sing-Lai Hwang Created in 1981 by and Yoon, and Yoon and Yoon in 1987. In 1993Further improved by Hwang, Lai and Liu. Became TOPSIS Narrow geometric Distance from selected alternative positive optical solution (PIS) and negative ideal Based on the idea that the solution must have a very long geometric distance (NIS) Consists of. Identify Weights for each criterion, each Every alternative and best alternative to the criteria Normalizing the marks and geometric distance between Compensation is a method of comparing the set of alternatives by calculation. The assumption of TOPSIS is The criteria increase uniformly or Decrease. Many because of parameters or Criteria scale problems often have Normalization of inappropriate dimensions is common needed. Compensation systems such as TOPSIS Trade between criteria Allow exchanges where bad results on one scale are good results on another scale May be denied by. It offers So much more than unpaid methods Realistic modeling form, in which Alternative solutions are included or excluded In terms of tough cut-offs. Its in nuclear power plants an example of application given.