The eastern Central Asian Orogenic Belt (CAOB), which located between Siberia Craton to the north and North China Craton to the south, has experienced complex evolutionary history of superposition of multi- tectonic domains and multi- cycle ocean- continental transition. Nowadays, majority of research try to reconstruct regional tectonic framework based on the main tectonic belts, however, there are always many controversial problems due to the uncertain positions and timing of the tectonic belts. This study focused on nature and formation process of main tectonic units, combining with evolution of regional tectonic belts, to redefine the basic tectonic framework of NE China, and establishing the pattern and evolutionary history of NE China Orocline. Our research shows that NE China region composed by two ancient blocks, Erguna and Jiamusi- Khanka blocks with Precambrian basements, and two accretionary terranes, Xing’an and Songliao accretionary terranes that formed by Paleozoic subduction- accretion process. These units were seperated by Xinlin- Xiguitu, Hegenshan- Nenjiang, Longfengshan and Solonker oceans. In the Early Paleozoic the SE Erguna block in the western NE China region was featured by “Western Pacific type” active continental margin, forming intra- oceanic arc of Gaxian- Jifeng- Huanyu and Toudaoqiao oceanic island, which together accreted to SE margin of Erguna block due to the closure of the Xinlin- Xiguitu Ocean at ca. 500 Ma. The following continuously retreat subduction of Hegenshan- Nenjiang oceanic lithosphere formed series of trench- arc- basin systems. The continuing collisions of the arc- continent led significant continental accretion to form the main parts of the future Xing’an accretionary terrane (XAT). Meanwhile, the west margin of Jiamusi block in eastern NE China region experienced “Andean type” subduction of Longfengshan oceanic lithosphere, forming Zhangguangcailing continental marginal arc (ZCMA) correspondingly. As a result, a huge west- to- east Early Paleozoic continental chain had been constructed by Erguna and Jiamusi blocks and their accretionary margins. In the south the subduction and accretion around Xilinhot and Longjiang ancient micro- continental fragments produced the primitive Songliao accretionary terrane (SAT). In the Late Paleozoic era, the Early Paleozoic continental chain experienced large scale rotation and bending due to the northward subduction and rollback of the Solonker ocean. During late Permain- middle Triassic the continental chain was further bulcked by both the subduction and rollback of Solonker ocean and the subduction compression of Mongol- Okhotsk Ocean and Panthalassa. The blocks, accretionary terranes, magmatic arcs and sediments were amalgamated and bended to form a huge NE China Orocline, with Erguna block and XAT as its western limb, Jiamusi block and ZCMA as its eastern limb, and SAT in the core.