Vinyl content method for controlling polybutadiene in elastomer

A method of controlling the vinyl content in polybutadiene of elastomers relates to the polymer synthesis field. Symmetric Lewis base has the following problem in the application that the relatively high content of regulator will reduce the rate of polymerization and impact further polymerization as well as the coupling process after the polymerization. The invention introduces an asymmetric ethers-polar compound in a regulator system to form a composite regulation system with symmetrical ethers or amines compound, wherein, the asymmetric ethers compound is alkylte trahydrofurruryl ethers, and the other polar reagent can be symmetrical ethers or amines compound, such as N,n,n',n',n-Pentamethyldiethylenetriamine (hereinafter referred to as PMEDTA), diethylene glycol dimethyl ether (hereinafter referred to as 2G), triethylene glycol dimethyl ether (hereinafter referred to as 3G). The method of the invention can increase the content of vinyl, without reducing the rate of polymerization; the coupling efficiency of the coupling reaction can reach 90%.