This invention involves a kind of big Kongrong that is used at alternative hydrogenation to exceed fine nickel activator, the technical issue that low, stability needs the microtherm active of activator of the existence in basically solving existing technology. This invention is used through collecting with weight per cent plan, include the following constituent: (ａ ) 5. 0 ～ 40. The metallic nickel of 0 ％ or its oxide; (ｂ ) 0. ０１ ～ 20. Of 0 ％ choose from at least one kind of element in molybdenum or tungsten or its oxide; (ｃ ) 0. ０１ ～ 10. Of 0 ％ choose from at least one kind of element in rare earth or its oxide; (ｄ ) 0. ０１ ～ 2. Of 0 ％ choose from at least one kind of element in A of the Ⅰ in periodic chart or Ⅱ A or its oxide; (ｅ ) 0 ～ 15. Of 0 ％ choose from at least one kind of element with silicon, phosphor, boracic or medium fluorine or its oxide; (ｆ ) 0 ～ 10. Of 0 ％ choose from at least one kind of element in B of the Ⅳ in periodic chart or its oxide; (ｇ ) the carrier alumina of surplus. Among them the diameter of nickel grain bead in activator is 2 ～ 4. Better land settled the technical program of 5 accept rice this problem, can use at splitting decomposition benzine in the industrial production of alternative hydrogenation.