1.adopt European advanced door and window technique and the making crafts, of exquisite workmanship, beautiful and luxurious and noble. 2.strip and off heat aluminium profile, imported process equipment, unique off heat complex technique assure enough pull resistance and cut resistance of the profile. 3.Double seal hollow window, multiple selectable hollow thickness 6,9.,12,18,20,25 4.Proper advanced seal water drainage system, making use of equilibrium principle, EPDM tape, total dry structure to reach an ideal air tight and water tight property. 5.high rigidity of windows, safe and firm and durable, applicable to high public construction and civil residential building. 6.different colors could be sprayed onto the surfaces both inside and outside of the window frames to match the inside and outside decoration tune respectively. 7.the window frame is clean free, maintenance free, durable, erosion resistant,aging resistant, anti-color fading, and with a life span of over 50 years. 8.in window is not only convenient for operation but also convenient for cleaning .Multi lock metal parts are flexible for operations of open and close, and firm and durable. 9.via change in different allocation of hollow glass and off heat aluminium profile, different comprehensive heat conducing parameter(value k), to meet the demand on heat preservation in particular environment.