A total of 74 CMS lines and their maintainers were evaluated for morphological and floral characters influencing out crossing rate. Out of 74 CMS lines, forty two CMS lines were completely pollen sterile for all other CMS lines. Spikelet fertility ranged from 0.51 to 4.55. The CMS lines viz., COMS 13, COMS 15, IR 68281, IR 69626, DRR 7, RTN 6, RTN 13 and PMS 17 were found to be promising for the characters pollen sterility, glume angle, panicle exsertion, stigma exsertion, natural out crossing. These CMS lines offer scope of utilizing them for the development of three line hybrid with high yield in rice.