①Pre-press: It refers to the work in the early stage of printing, generally refers to photography,design,production, typesetting, output film proofing,etc..

②Press: It refers to the mid-printing work,the process of printing the finished product through the printing machine;

③Post-press:It refers to the post-printing work,generally refers to the post-processing of printed matter including laminating, UV varnish,oil varnish,die cutting,hot stamping,embossing, mounting,binding,cutting and so on,which is mostly used for publicity and packaging printing products.