The new 1 : 50,000 regional geological survey and tectonic study conducted by the authors, strike slips of the key geologic bodies on two sides of the Tancheng-LuJiang (Tanlu) fault (volcanic rocks of the Xileng Rock Formation, phosphorus ore beds of the Susong and Feidong Rock Groups, Dabie Rock Group and Kanji Rock Group), the character and trend of the extension lineation, and the second-order faults on two sides of the Tanlu fault all revealed that the southern section of the Tanlu fault has no huge left-handed strike slip. Thus, a new explanation was proposed in regard to the huge dislocation between the Dabie Mountains and Sulu (North Jiangsu-South Shandong Province) orogenic belt. The authors think that the Dabie-Sulu orogenic belt has arcuate distribution, basically representing its original tectonic orientation, and that the Tanlu fault is a negative structural zone resulting from multi-stage tectonic events.