Abstract: Organic silicon modified waterborne polyurethane extinction resin were prepared by poly(tetramethylene ether) glycol (PTMG), polydimethylsiloxane (PDMS), isophorone diisocyanate (IPDI), and dihydromethyl propionic acid (DMPA) as monomer, triethylamine (TEA) as neutralizer, and ethylenediamine (EN) as chain extender. FT-IR, LPSA, SEM, EDS, and 60° photometer were carried out to investigate the structure and properties of WPU. The effects of R (the molar ratio of —NCO and ¬¬—OH in the reaction raw materials) and PDMS content(characterized by the ratio of moles of PTMG to PDMS) to the gloss of WPU were discussed while the properties of WPU were explored. The results show that when R=2.3, n (PTMG/PDMS) =1:2, the particle size of WPU emulsion is 300.8 nm, and the stability is good. SEM shows that the surface of the WPU film is formed with compact micron grade spherical bulge, and its glossiness gloss reaches a minimum of 10.9, the water absorption is 23%, so its comprehensive performance is excellent.