A series of NE trending middle—late Early Cretaceous I- type and A- type granites expose in SE China. This study investigates the Suzhou, Huangshan, Lingshan and Fuzhou I- type and A2- type granitic complexes in the belt for their petrographic, geochemical and zirconological characteristics. The work summarizes: ①The (amphibole- bearing) biotite monzogranite, as a main intrusive phase of the granitic complexes, was formed from weakly fractionated granitic magma in the upper crust. This rock is typical I- type granite with zircon U- Pb age of 127. 1±1. 8 Ma, representing the emplacement time of syn- orogenic granite；②The zinnwaldite/muscovite alkali- feldspar granite formed as a subsequent intrusive phase of through the crystallization of highly fractionated granitic magma of the same origin. The rock is typical A2- type granite with zircon U- Pb age of 105. 4±1. 3 Ma, representing the emplacement time of post- orogenic granite；③Ores correlated to these granitic complexes formed magmatic—hydrothermal deposits with zircon U- Pb age of 106. 4±2. 3 Ma, representing the time of a large- scale of mineralization in SE China. Combing the structural geology, geochronology of granitic magmatism, and the correlated mineralization in SE China, this study proposes that the subduction of the Kula plate under the Euro—Asiatic continent in the early period of Early Cretaceous caused crustal thicking, thrust faults, and anatexis in SE China. Magma chamber developed in the middle—lower crust and I- type granites intruded in the upper crust as a main intrusive phase of the granitic complexes. After zenith of compressional subduction, the regional tectonic environment changed from compression to relaxation in SE China, I- type granitic magma in deep- seated chamber underwent a long period of fractional crystallization and generated ore- forming material enriched residual magma at top of magma chamber. At the ending period of Early Cretaceous, the regional tectonic environment entered the extensional regime in SE China. The shearing—compressive faults converted to shearing—extensional faults and small volume of highly fractionated residual magma ascended rapidly from the magma chamber in the upper crust. Due to rapid pressure decreasing, along with sharply decreasing of temperature, the highly fractionated residual magma separated into two portions due to fluid—melt immiscibility, and formed a metal- rich silicious fluid and a deprived felsic melt. The fluid phase had low density and viscosity and ascended quicker in the extensional system, solidified as quartz vein- type deposit（or greisens- type/skarn- type deposit）；whereas the melt phase moved slower and filled the extensional system as subsequent intrusive phase of the granitic complexes. The event of this large- scale of granitic magmatism and mineralization in SE China is classified as a new orogenic movement——the Huangshan Movement. This orogenic movement is characterized by two iconic time- points: ??127 Ma of the syn- tectonic granite（i. e., I- type granite）emplacement age as the compressional climax and ??105 Ma of the post- tectonic granite（i. e., A2- type granite）emplacement age as the extensional climax. The conversion from compressive to extensional regimes was around ??110 Ma. The comprehensive interconnection of regional geological events, tectonic movement—magmatism—mineralization, has revealed the fundamental geological characteristic of SE China in middle—late Early Cretaceous period.