The origin and geodynamic evolution of the Jiao- Liao- Ji tectonic belt have long been controversial. This article summarizes comprehensive research results on the tectono- magmatic- metamorphic processes and metasedimentary- volcanic successions in this belt. It is found that the 2.2~2.0 Ga pre- orogenic granitoids are mainly A- type, formed in a high- temperature, low- pressure extensional setting. Some are I- type granitoids derived from partial melting of mafic rocks in the lower crust. These pre- orogenic granitoids, along with metamafic intrusive rocks, metarhyolite- dacite, and metabasalt, constitute a bimodal magmatism in a continental extension setting. Their geochemical “arc magma” affinity is mainly inherited from Archean TTG rocks or attributed to crustal and/or continental lithospheric assimilation- contamination during mafic magma upwelling. Litho- tectonic assemblage (residual oceanic crust, subduction accretionary complexes, retroarc structures, large strike- slip faults, paired metamorphic belts, and spatiotemporal variations in magmatic activity) similar to that produced by modern- plate subduction has not been found in the Paleoproterozoic Jiao- Liao- Ji tectonic belt. The Longgang and Nangrim blocks share a coherent Archean basement and evolutionary history. The different metasedimentary strata in the “southern belt” and “northern belt” were deposited on a stable passive continental margin between 2.20 and 1.95 Ga. These strata share a similar provenance and underwent partial medium- pressure (MP)- high- pressure (HP) and high- temperature (HT)- ultrahigh- temperature (UHT) granulite- facies metamorphism with clockwise P- T paths involving isothermal decompression at ca. 1. 95~1. 80 Ga. Based on comprehensive geological and geophysical evidence, we propose the following tectonic model for the origin and geodynamic evolution of the Paleoproterozoic Jiao- Liao- Ji tectonic belt. ① Voluminous high- density granulite- eclogite facies residuals formed in the lower crust alongside the generation of extensive Archean TTGs in the Eastern block. The stable cratonic lithospheric mantle formed at the end of the Archean allowed these high- density granulite- eclogite facies residuals to be stably preserved in the lithosphere. ② During 2. 2~2. 0 Ga, intracontinental extension driven by upwelling of an asthenospheric hotspot along the Jiao- Liao- Ji belt fractured the Eastern block into the northern Longgang block and southern Nangrim block. ③ At ca. 1. 95~1. 85 Ga, the negative buoyancy of the high- density eclogitized lower crust and lithospheric mantle triggered their subduction (sinking), forcing convergent orogeny between the Longgang and Nangrim blocks along the Jiao- Liao- Ji belt. ④ At ca. 1. 85~1. 80 Ga, orogenic belt collapse caused by delamination of the orogenic root, followed by subsequent hot asthenospheric upwelling, resulted in the rapid exhumation and post- orogenic extension of the orogenic belt.