The objective of this thesis is to study and analye varieties of power reductiontechniques, particularly focusing on system-level DPM and DV3 techniques.this studyls done theoretlcally and through simulatlons.In oder to realize the low power implementation,a profiler was established to periodically trace the detailed Informatlon during working process,and based on which the ideal power consumptions with chosen algorithms are estimated.Because no dynamic power reduction implementation existed before, a low power program has been made for the MPEG2 playback applicatlon on PNX1500 media processor.