One-dimensional (1D) molecular structures have received intensive attentions both from scientific and technological point of view.One of the motivations is that 1D structure can be used as molecular conductive wires in future molecular devices.By means of on-surface synthesis,covalent bonded stable 1D molecular structures can be achieved.[1-5]Design of molecular precursors,control of growth kinetics,and selection of supporting surfaces are the key factors which can greatly influence the formation of 1D molecular structures and their alignment.