It's clearly obvious that the use of computer programs, especially finite element method in structural analysis, gained a distinguished popularity in the presence of expensive hard experimental works in the field of concrete structures, modeling with a proper finite element program in idealization the considered structure is greatly needed. Today, the use of shotcrete for strengthen of the concrete structures in large scale is increasing due to it's advantage, the properties and the factors effect on it, has been discussed. This work presents an theoretically investigation concerning the efficiency for the reinforced concrete columns Four Columns (20x20x100) were tested under compression loading and had the same cross section of dimensions and main longitudinal reinforcement distribution and cross sections for all columns. (Usama 2002) made four Columns (20x20x100) were tested under compression loading and The deformations were measured by linear variable differential transducers LVDT's, two transducers in both sides to measure the longitudinal deformations ( LO ) and three in the lateral direction to measure the lateral deformations: the first (EQ1) was near the end of the column, the second (EQ2) was in the middle and the third (EQ3) was in the middle between the fist and the secondhad the same cross section of dimensions and main longitudinal reinforcement distribution and cross sections for all columns. These Columns had four deformed longitudinal steel bars 10 mm diameter. New formula in the three dimensional for numerical modeling to compare between strengthening columns [5] was produced by the author.