The Cguardian catalogue App is designed to take full advantages of growing new mobile devices, as smartphones, with their handy features and good operating experience. Based on Apple iOS, with handheld mobile devices of iphone, for example, to be its carrier, the app acts as a plat which conveniently delivers Cguardian Auction’s all relating information to the whole end users, including collectors, buyers, investors and art lovers, etc. Users can rapidly access to relevant auction information on their iPhones anytime anywhere. The main features including: Previews: a comprehensive display of Cguardian’s upcoming auctions and its item details, including action time, location and the catalogue of lots News center: pressing Cguardian Auction’s latest news and announcements. Results: a comprehensive display of Cguardian’s past auctions and item details. Join action: releasing the related Law of auction and the rules of action.