An age of the 443.6 of Ma (MSWD=6.3) was obtained through LA- ICP- MS zircon U- Pb dating on zircons from the Cretaceous dioritic intrusive rocks in Lingtou area, Anyang County, southern Taihang Mountains, which is in late Late Ordovician. This is the first record of Caledonian magmatic intrusion activity found in the North China Craton, in addition to the Middle Ordovician kimberlite distributed along the Tancheng—Lujiang fault zone, which provides evidence for revealing the Early Paleozoic tectonic—magmatic evolution of the North China Craton. Combined with the characteristics of the regional tectonic—magmatic event in the same stage, we propose that there is an intraplate break- up event in 443.6 ± 6.1 Ma. That is Late Ordovician (ca. 440 Ma)，the breakup of Paleo- Laurasia to create the North Pacific Ocean, caused that the North China Craton drift apart from Canada Shield and North American Platform——the response to the tectonic events affecting the global in North China Craton. In view of the high correlation between the Ordovician magmatic intrusion activity in the stable craton region and the primary diamond deposit, this finding also provides an important reference for the search of primary diamond deposit.