In　this　paper　there　is　a　low-power　consumption　calculator　is　based　on　the　micro　controller　of　C8051F231.　Discuss　the　type　of　low-power　consumption　micro　controller　and　minimum　system　design,　analyze　principle　of　CMOS　power　consumption,　research　the　application　of　low-power　consumption.　Power　Management　Techniques　for　8051F231　The　calculator　of　liquid　measure　of　counter-recoil　mechanism　of　gun　is　a　good　way　to　displace　the　traditional　method.　It　may　improve　efficiency　and　precision.　But　as　a　pocket　electronic　product,　low-power　is　necessary　in　order　to　meet　the　user＇s　need.　The　question　of　low-power　is　main　barrier　of　pocket　electronic　system　With　the　high　development　of　micro-electronics,　low-power　parts　is　the　base　of　low-power　system　There　are　two　sides　including　low-power　parts　and　low-power　system.