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With the addition of Hydrogen as a relative molecular mass regulator and TiCl4/MgCl2-Al（i-Bu）3 catalyst system, Polybutene-1-thermoplastic elastomer （PBt） was synthesized in 3L autoclave. The conversion, [η], insoluble content in Ether and crystallization of PBt-TPE were studied under various polymerization conditions such as Hydrogen pressure, temperature, Al/Ti and Ti/Bt ratio. It was showed that the optimal polymerization conditions are: [Bt]=50wt%, Ti/Bt=3×10-5, Al/Ti=300（mol/mol）, T=3040℃ 。 With the increasing of the polymerization temperature, the [η] and the insoluble content in Ether of PBt will increase first and then decrease. Hydrogen is an efficient modifier of the relative molecular mass of PBt. The [η] of PBt will increase first and then decrease with the increasing of hydrogen added in the process of polymerization. DSC curve shows that PBt have two melt peaks while the temperature condition is 40℃, the melt point（Tm） are respectively 110.3 ℃ and 98.3℃;The most tallest glass transition temperature is -16.2℃ when temperature is 30℃. The properties of low relative molecular mass PBt were determined by relative molecular mass of PBt. With the increasing of polymerization temperature and Al/Ti, Tensile strength,Tear strength ,Modulus at 100% and 300% ,Hardness will increase first and then decrease. There is the optimal properties when temperature is 3040℃.The experiments of copolymerization between butane-1 and hexane-l（PBH） showed: the optimal polymerization conditions （molar content of He-1 was 20%） were: T=4050℃, Al/Ti=400500, Ti/BH=3 4×10-5. With the increasing of the polymerization temperature, the [η] and the insoluble content in CH2Cl2 of copolymers of butylene-1 and hexene-1 would decrease. And the increasing of the content of
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