ADC　modules　play　an　important　role　in　electronic　measurement　systems,　and　comparators　are　the　core　components　of　ADCs.　Comparator　properties,　especially　offset　voltage,　have　an　essential　effect　on　the　accuracy　of　ADCs,　and　then　affect　accuracy　of　the　system.　An　implementation　of　low　offset　latched　comparator　is　presented　by　this　paper,　which　could　decrease　the　offset　tremendously.