Abstract:This paper collected more than 200 isotopic age data of igneous rocks in Northeast Jiangxi Province and vicinity areas, made synthetic analyses from many geologic data of previous studies, and summarized in detail the process of magmatisms, tectonic evolution and geodynamic background of this area from middle Proterozoic to Cenozoic. No precise datum related to magmatism of Early Proterozoic or earlier ages is found, which might reveal the lack of old continent crust in this area. The abundance of various types of igneous rocks with Meso- to Neoproterozoic ages provided important evidence for the forming and developping of Jiangnan Orogeny Belt in the southeastern margin of Yangtze Plate. The tectonic-- magmatic activity in Paleozoic Era was generally not intensive, and only developped in several Hercynian-- Indosinian fault depression zones, where marine volcanism and related hydrothermal activities took place and caused some Sedex type mineralizations. The Mesozoic Era, especially the Yanshanian period, was the most intensive stage of magmatic activities in Northeast Jiangxi Province. It was also an important time for the formation of large-scale Cu--Au and poly-metallic deposits in this area, such as the super-large Tongchang--Fujiawu porphyry copper deposit related with early Yanshanian granodiorite porphyry, and the Yinshan polymetallic deposit related with sub-volcanic rocks. They are representative samples of Mesozoic metallogenic explosion in East China. In Cretaceous, the Northeast Jiangxi area was in an extensional tectonic environment, resulted in the development of some bimodal igneous rock suites. Up to Cenozoic, the tectonic--magmatic activities became extensional zones. Some ideas concerning to several paper based on our recent study. weaker, only a few igneous rocks existed in some controversial questions are also put forward in this paper based on our recent study.