Outline 1 Overview of Exotic Zc and Zb States 2 Brie y Introduction of QCD Sum Rules 3 Mass spectra of tetraquark states with JPC = 1+-4 Mass spectra of molecular states with JPC = 1+-5 Summary Production mechanisms of XYZ states Since 2003,many new charmonium-like states are discovered experimentally:Overview of XYZ States Many XYZ states were discovered above the open-charm threshold since 2003.