The　Paris　agreement　is　a　unified　arrangement　for　the　global　response　to　climate　change　and　entered　into　force　on　4　November　2016.　Its　long-term　goal　is　to　hold　the　global　average　temperature　rise　well　below　2　degrees　C.　China　is　committed　to　achieving　carbon　neutrality　by　2060　through　various　measures,　one　of　which　is　green　technology　innovation　(GTI).　This　paper　aims　to　analyze　the　levels　of　GTI　in　30　provinces　in　mainland　China　between　2001　and　2019.　It　uses　the　spatial　econometric　models　and　panel　threshold　models　along　with　the　slack　based　measure　(SBM)　and　Global　Malmquist-Luenberger　(GML)　index　to　analyze　the　spatial　spillover　and　nonlinear　effects　of　GTI　on　regional　carbon　emissions.　The　results　show　that　GTI　achieves　growth　every　year,　but　the　innovation　efficiency　was　low.　China＇s　total　carbon　dioxide　emissions　were　increasing　at　a　marginal　rate,　but　the　carbon　emission　intensity　was　declining　year　by　year.　Carbon　emissions　were　spatially　correlated　and　show　significant　positive　agglomeration　characteristics.　The　spatial　spillover　of　GTI　plays　an　important　role　in　reducing　carbon　dioxide　emissions.　In　the　underdeveloped　regions　in　China,　this　emission　reduction　effect　was　even　more　significant.