The Early Cretaceous intrusive rocks with large exposed area in Anlin area in the south of Taihang Mountain are studied. Through the study of the genetic types, material sources and formation age of the intrusive rocks in this area, the regional tectonic evolution process of Anlin area and the lithospheric thinning mechanism in Taihang Mountains area are further discussed. Methods: Detailed geological survey, rock geochemistry and LA-ICP-MS zircon U-Pb chronology of Mesozoic intrusive rocks in Anlin area, southern Taihang Mountains. Results: The study shows that the intrusive rocks in Anlin area were formed in 129. 1± 1. 0 ~ 129. 7 ± 1. 1 Ma, belonging to the Early Cretaceous, which is similar to the intrusive complexes in other areas of Taihang Mountains and even the whole North China; The total amount of light rare earths(LREE is 113. 71×10-6 on average)in Mesozoic intrusive rocks in Anlin area is significantly higher than that of heavy rare earths (HREE is 11. 97×10-6 on average), which has the characteristics of relatively obvious right inclined distribution form of enriching light rare earth elements, weak positive anomaly of Eu and relative enrichment of large ion lithophile elements, and has the characteristics of high Sr and Ba content and high Sr / Y, (LA / Yb) N ratio. Conclusions: The late Mesozoic Taihang Mountains Area and North China experienced the same geodynamic background and tectonic environment, indicating that the South Taihang Mountains area is within the lithospheric thinning range of the North China Craton; combined with the characteristics of regional tectonic evolution, the main genetic mechanism of Mesozoic magmatism in Anlin area in the southern part of Taihang Mountains is crust mantle magmatic mixing.