Square reinforced concrete, (RC), columns are commonly used in residential buildings, moreover, the increase of earthquake loads requires an increase in both the axial capacity and ductility of columns in addition to its flexural capacity. The major disadvantages in constructed columns are working by mistake in number of steel stirrups and sometimes concentration of steel stirrups in bottom of columns this make weakness points on the column. ACI and ECP Recommended: As the use of FRP systems undergoes continuous development, it is permitted to use FRP systems other than those mentioned in this section. Such permission is subject to providing proof of the efficiency of the system through carrying out a sufficient number of tests. Such test results shall proved evidence for the satisfaction of the conditions of equilibrium and strain compatibility. This paper presents an experimental program conducted to study the behavior of RC square columns strengthened with carbon fiber reinforced polymer (CFRP) sheets with full and partial wrapping under axial loading. The program consists of a total of fifteen columns. The overall dimensions of the square columns are 150 x 150 x 2100 mm. The columns were tested under monotonic uniaxial compression loading up to failure. One layer of CFRP sheets were wrapped around the columns with different intervals between the wraps. An analytical model based on the stress-strain characteristics of concrete under triaxial state of stresses is proposed to predict the deformational behavior as well as the ultimate capacity of square RC columns strengthened by CFRP sheets Different recommendations and design guidelines for square RC columns strengthened by CFRP sheets are introduced