This research paper examines the effect on competency mapping usage in manufacturing industries with reference to Krishnagiri District Tamilnadu. The primary data collected from the 107 executives from different manufacturing industries in to Krishnagiri District Tamilnadu. Percentage method is used to represent the data for easy and better analysis of competency mapping. This paper found the HR managers feels that competency mapping is the competitive Advantage for the manufacturing industries; they believe that the fast changes happening in the demography and social systems thereof have given chance for various HR practices enhancing the Executive productivity and growth. One of the most commonly used HR practice is competency mapping for development of the Executives. Identifying and development of the competencies in organization enable better performance leading to career and succession planning programs.