A　99.9%　Silver　was　cold-rolled　to　93%　reduction　and　annealed　at　different　temperature.　The　results　show　that　the　cold-rolled　and　recrystallization　texture　,　in　principle,　agree　with　previous　works.　In　order　to　explain　the　texture　change　,　a　model　of　brass　recrystallization　,　which　was　developed　by　Bunge　and　others,　was　used　,　In　this　model　the　orientation　change　during　annealing　is　assumed　to　be　determined　by　n-generation　twinning　and　by　the　fast　growing　orientation.　However　,　the　factors　to　determine　the　twin　process　and　the　fast　growing　orientation　are　remained　to　be　solved.　In　this　paper　a　grain　boundary　migration　model　is　proposed　in　which　the　migration　direction　is　determined　by　the　surface　energy　difference　of　the　neighboring　crystal　planes　,　low　energy　planes　tend　to　grow.　With　such　a　concept　the　twinning　process　and　the　＂fast　growing＂　texture　component　can　be　understood.