Almost one-third of the worlds orchid species have the deception pollination systems.For most of this species,pollination strategies have been specialized due to the preferences (color and scent) of local specific pollinators.Therefore,key floral signals,i.e.,visual (color) and olfactory (odor) cues play a primary and central role in attracting pollinators.In this study,floral signals of rewardless orchid Paphiopedilum micranthum were investigated by combining the floral color and scent analysis and pollinators behaviors bioassays to identify the attraction mechanism of floral signals in targeting pollinator bumblebees.Floral VOCs blends were collected and analysed by GC-MS (Gas chromatography with mass spectrometry).Via combined the GC-MS with EAD (Eiectroantennographic detection) techniques,the compound which perceived by pollinators was identified.Floral surface reflectance of P.micranthum and sympatric flowering species visited by bumblebees were measured by spectrometer,and then were plotted in bee color space to obtain the similarity of floral color patterns perceived by bumblebees in rewardless orchid and rewarding local flowering species.