Abstract: “Geometrical product specifications (GPS) —— indication of surface texture in technical product documentation (GB/T 131-2006)” is a general standard in GPS series of new generation, and it stipulates the marking rules of surface texture requirement in technical product documentation. Three main surface texture parameter groups about evaluating surface texture in GPS series standards are concisely introduced in the paper. The detailed analysis and balance for the change of the marking rules of surface texture in new and old standards are performed and their distinct something is pointed out. Simultaneously, the marking rules, extending new contents, marking examples, and explaining and reading about new standard are listed out. These can provide the consultations for correct comprehension and implementation about new standard for teachers engaged in engineering graphics teaching and for compiling and revising engineering graphics textbooks.

Key words: engineering graphics, marking of surface texture, indication of surface texture, national standard