中文摘要：

本文对鄂尔多斯乌兰木伦遗址2010年第2次试掘和2011-2012年正式发掘出土石制品中的136件经过修理的工具进行研究。这些修理工具的类型以锯齿刃器、凹缺器和刮削器为主,比例均在20%以上。其他如钻具、尖状器、石镞、琢背石刀、雕刻器、鸟喙状器等器型的比例偏少。原料以等级较好的石英岩为主（92%）。毛坯以石片为主（99%）,且以完整石片居多（74%）。多数修理工具的个体较小,分布于20-50mm之间。修理主要采用锤击法修理;修理方式以单面修理为主（91%）,其中又以正向修理为多（80%）。刃缘多为直刃,修疤层数多为一层,修疤进深偏短,修理长度指数较高。这批修理工具的整体特点,特别是修铤的出现反映出遗址古人类在狩猎、屠宰等方面的明显需求。

英文摘要：

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 bees 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.