It is necessary to mark surface-roughness in the part drawing. But there is not the function of marking surface-roughness in AutoCAD. If the user wants to draw the part drawing with AutoCAD, he must resolve the problem of marking surface-roughness by himself. However,the author often sees that some marks of marking with AutoCAD do not conform the marking to national standard. This paper introduces the method of marking surface-roughness. It is done by inserting to defining the data of surface-roughness as changeable attribute through the blocks with attribute which in AutoCAD. Most important of all, the author defined two blocks-Ra1 and Ra2 in order to conform the marking completely to national standard.
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