Based　on　the　concept　of　a　＂biological　legal　person＂,　this　paper　puts　forward　a　new　definition　of　family　business:　family　business　is　a　form　of　biological　organization　controlled　by　family　genes.　Family　genes　are　the　decisive　factor　for　its　growth　and　continuation.　The　process　of　family　business　succession　can　be　regarded　as　the　inheritance　of　genes.　The　genes　of　family　business　succession　are　a　combination　of　genetic　elements　having　characteristics　of　structure,　stability,　heritability,　expressiveness　and　variability.　The　process　of　family　business　succession　includes　the　mechanisms　of　genetic　heredity　and　variation.