A pattern printing system and data processing method thereof are disclosed, which are suitable for printing patterns on printed circuit boards or data format rearrangement printing used in displays. The pattern printing method includes a process for interpreting scription data into matrix data, a procedure for modulating the print head resolution and the printing resolution, a procedure for interpreting and transmitting data commands, a procedure for rearranging memory data, and a procedure for firing data synchronously so as to achieve high-resolution printing and to continuously modulate any print data.