Ink-jet printing is based on the concept of a micro-liquid process and is expected to be an innovation process in FPD manufacturing. In precision Ink-jet printing, basic technique of controlling dot-landing, location, process of film formation, surface design and surface treatment of substrate are each very important elements of the process. The technique that is mainly used is a combination of both bank structure with photolithography and Ink-jet, which enables high definition printing. The bank has a property designed to repel ink solvents via surface treatment. In addition to discussing this technique, various surface treatments utilized in inkjet printing to produce a variety of devices are reported. The current situation of surface treatment technique for several applications will be introduced.