In the Awati-Manjar transition zone of northern Tarim Basin, the Ordovician sedimentary sequence is characterized by the presence of extensive diabase intrusions. These igneous intrusions are not only key evidence for the magmatic activity process of the Tarim Large Igneous Province, but also closely related to oil and gas migration and accumulation, providing guidance for oil and gas exploration. Based on seismic profiles and drilling data analysis, combined with isotopic dating methods, this study systematically studies the diabase intrusions in the Awati-Manjar transition zone, revealing their formation time and spatial distribution characteristics, and discussing their emplacement mechanism. The results show that the diabase intrusions can be divided into two types: steeply dipping intrusions and layered intrusions. Steeply dipping intrusions generally unconformably intrude into the Sangtamu Formation and are concentrated in the YM, GL, and MS drilling areas, as well as the AM and AM north drilling areas. Layered intrusions intrude conformably into the top of the Yijianfang Formation, Tumuxiuke Formation, and Lianglitage Formation and are concentrated in the MS and FY drilling areas, with small-scale distribution in the YM west, GL, and AM north. Steeply dipping and layered diabase intrusions can exist independently, but in most cases, they are closely connected in three-dimensional space, forming symmetrical or asymmetrical disc-shaped intrusions. Zircon U-Pb isotopic dating results indicate that the diabase intrusions crystallized between 303～285 Ma, and can be further divided into two stages. The intrusions of first stage are limited in distribution. They occurred around 303 Ma, corresponding to the first phase of magmatism in the Tarim Large Igneous Province. The intrusions of second stage, as the majority of the diabase in the study area, occurred around 285 Ma, corresponding to the third phase of magmatism in the Tarim Large Igneous Province. The diabase intrusions are composed of feeding veins, internal beds, inclined veins, and external beds from bottom to top, which make up of a vertically related intrusive system. The top of the Middle and Lower Ordovician serves as an important structural transition surface and lithological interface, controlling the lateral intrusion and expansion of the magmas. Meanwhile, the planar distribution features are jointly controlled by the mantle plume activity, the regional stress field evolution and the basement structure feature.