Based　on　asymmetric　one-dimensional　photonic　crystal　structure,　a　dual-wavelength　vertical-cavity　surface-emitting　laser　(VCSEL)　with　modified　standing　wave　field　distribution　has　been　constructed.　The　defect　layer　is　Al0.8Ga0.2As　with　5　lambda/4　thickness.　Specifically,　the　dual-wavelength　output　spectrum　of　the　VCSEL　has　low　absorption　loss,　easy　wavelength　adjustment　and　same　output　direction.　In　addition,　the　two　wavelengths　and　their　spacing　could　be　tuned　by　changing　the　refractive　index　contrast　of　the　asymmetric　PC　structure　and　the　thickness　of　defect　layer.　Such　dual-VCSEL　structure　can　be　applied　in　optical　bistable　switches,　amplifiers,　modulators　and　detectors,　etc..