In CMOS design goals, CMOS technology provides better results than TTL (Transistor Transistor Logic). But today, due to increasing prominence of portable systems, speed and low power designs are major issues in high performance digital systems. Flip-flops are basic storage elements used in all kind of digital systems. Flip-flops are widely used in memory elements, counters and registers also. And these circuits are used to implementation of VLSI chips. So, power consumption is the major concern in this which should be improved.