Studying star clusters is a way to test theories of stellar evolution in astronomy. Using current theories, the mass, age and components of a star are affected and decide the position of star in the Hertzsprung-Russell color-magnitude diagram. To study the role of mass in stellar evolution, we need to look at star clusters of which all stars were formed at the same time and are located at the same distance from planet Earth. In the study, the authors have done photometry for open cluster M67. Photometric results are plotted in the color-magnitude diagram. The number of stars in each evolutionary phase has been estimated. The existence of blue stragglers in the result requires further research about stellar evolution and interacting binary stars.