An　efficient　scheme　is　demonstrated　to　improve　the　experimental　accuracy　of　metal　linear　expansion coefficient　with　the　FD-LEA-B　instrument.In　this　scheme，the　dial　gauge　method　is　used　to measure　the　elongation　of　Copper　sample　changing　with　the　temperature　from　20℃to　50℃.In　addition，　the　application　of　Origin　software　is　used　to　analyze　the　measurement　results　at　different　heating　processes.The　result　shows　that　measuring　the　elongation　of　Copper　sample　with　the　interval　of　2℃in　the　process　of persistent　overheating　is　the　most　desirable　way　for　the　FD-LEA-B　instrument.Adopted　the　least square　method　to　fit　the　measurement　results　linearly，the　Copper　sample's　linear　expansion　coefficient　is 16.0×10-6℃-1.