A　one-dimensional　defective　photonic　crystal　stacked　with　layers　of　nonlinear　material　and　air,　sandwiched　by　two　perfect　structures,　is　designed　for　multiple　wavelengths＇　second　harmonic　generation　(　SHG).　The　fundamental　waves　(　FWs)　and　SHGs　are　located　at　the　defect　states　of　the　photonic　crystal　in　different　photonic　bandgaps.　Due　to　the　strong　localization　and　low　velocity,　giant　enhancement　of　the　conversion　efficiency　is　achieved.　The　constructed　structure　can　be　used　for　optical　multiple　wavelengths＇　conversion　to　match　practical　demands.