Conjugate　gradient　method　is　proposed　for　parameter　identification　and　chaos　synchronization　using　the　drive-response　synchronization　framework.　The　scalar　drive　signal　is　used　to　drive　a　response　system　with　the　same　structure　as　that　of　the　drive　system　and　tunable　parameters.　Chaotic　system　is　extremely　sensitive　to　parameter　mismatch,　chaotic　systems　with　same　structure　and　different　parameters　can　not　synchronize.　Therefore,　minimizing　the　synchronization　error　by　adjusting　the　parameters　of　response　system　will　eventually　lead　to　synchronization　of　drive　system　and　response　system,　at　the　same　time　the　parameters　can　be　obtained.　The　conjugate　gradient　method　is　adopted　to　search　the　real　parameters,　which　make　synchronization　error　minimum,　so　that　the　parameters　of　drive　system　are　identified,　and　synchronization　between　drive　system　and　response　system　occurs.　This　method　is　independent　on　the　drive　system　parameters.　Synchronization　is　accomplished　without　the　need　of　all　state　variables　of　the　drive　system.　The　convergence　speed　of　parameters　is　fast.