Admission into the B.Tech and Dual-degree (BTech-MTech) programs of all departments of all IITs is made once a year through a Joint Entrance Examination (JEE).
More information is available at the JEE Website.
The CSE Department at IIT Kanpur admits 78 students every year in its BTech program, and 23 students (Average number of students admitted in last four years) in the Dual-degree (BTech-MTech) program.