Z-SBA-15 mesoporous material with a zeolite structure in the pore walls has been synthesized by using a zeolite-dissolving method with the commercial ZSM-5 zeolite as raw material. The effect on the synthesis of varying the reaction temperature,reaction time,Si/Al ratio in the ZSM-5 precursor,amount of zeolite-dissolving solution and pH value of the initial gel were investigated by means of XRD and TEM. The results showed that the optimum synthesis conditions are:temperature 100-110 ℃,reaction time 36-48 h,...