In order to clarify the importance of the equations used in the text, it had begun to explain the intercropping systems and their practices as well as examples in different countries in the world before explaining the formulas for intercropping systems evaluations .Formulas to evaluate the simultaneously intercropping systems of biological and economical basis were mentioned( ELER1 and ELER 2 ).While , Modified Economic Land Equivalent Ratio equation ( MELER ) was established and applied too. Formulas for relay intercropping and crop sequences systems evaluations were used to evaluate the...