Amines serve as crucial structural units in pharmaceuticals， functional materials， and natural products， and their efficient synthesis has always been a core topic in organic chemistry research. In recent years， transition-metal-catalyzed C―H bond activation has emerged as a highly efficient strategy for constructing complex amine derivatives. The core challenge in amine C―H bond functionalization lies in directing the transition metal to selectively cleave the target C―H bond. Direct use of the native amine group as directing groups often leads to catalyst deactivation and side reactions such as β-hydride elimination. While covalently linked directing auxiliaries enable precise activation， they require additional installation and removal steps， reducing synthetic efficiency. The recently developed transient directing group （TDG） strategies achieves selective activation of C―H bonds through reversible binding between the directing group and the substrate. This approach not only allows precise targeting of the desired C―H bond but also eliminates the need for pre-installation and removal of directing groups， significantly enhancing the atom economy and step economy of the reactions. This review systematically summarizes the progress in transition-metal-catalyzed C―H bond functionalization of amines via transient directing group strategies over the past decade. It focuses on the development and structural characteristics of different types of transient directing groups， and provides a detailed analysis of their applications in arylation， alkynylation， fluorination， oxidation， thiolation， and sulfonylation reactions. Additionally， the review discusses current limitations in the field， including reaction types， cost control， reaction conditions， and stereoselectivity， and prospects future directions such as the design of novel transient directing groups and the construction of new catalytic systems.