Abstract: In the stone artifacts from the 2nd trial excavation in 2010 and formal ones in 2011-2012, 136 retouched tools are chosen to be studied in the present paper. Denticulates, notches and scrapers are the majority types of them. Borers, points, projectile point, backed knives, burins and becs are parts of minority. Raw material is dominant by high quality quartzite (92%). Tool fabrication are based on flakes (99%), which are mostly complete flakes (74%). Most of the tools were retouched unifacially (91%) by direct hammer percussion and are medium size. Pieces made on flakes were modified overwhelmingly on the dorsal surfaces(80%). It is observed that many retouched edges are straight. Most tools are displayed single layer of modification scars with index of short retouch-invasiveness and high retouch-length. The retouched angles of the edge became larger than the original ones of the blank. Tanged type were specially retouched for hafting needs of the tools. All these phenomenon presents some positive behavior of ancient tool maker’s adaptation for their life environment at period of 50-65Ka in Middle Paleolithic times.

Key words: Retouched tools; Retouch technology; Ordos; Wulanmulun site