Adipic acid is synthesized by means of a “one-pot” reactive mode with cyclohexene and hydrogen peroxide(w=30%) using modified catalyst 400PW/SBA(40)（brief note PW/SBA）. The process is the scientific method of clean synthesis becauce of no organic solvents. Three steps were taken in the study to optimize the conditions of the synthesis process of adipic acid. First of all, the basic route of synthesizing adipic acid was determined by pre-experiment program. Then the orthogonal experiments method and the single factor test method was used to optimize the conditions of reaction process. Finally, the better process of synthetic routes and conditions was tested by using the parallel experiment methods . The obtained condition is reaction time 12h, temperature 80℃, the amount of catalyst 1.75g, n(H2O2): n(cyclohexene)=5.47:1, adding the amount of another 1/2H2O2 after reaction time is 3.5h. The results indicate that the yield of adipic acid could reach 74.5% , and purity quotient 99.7% under the optima condition. Moreover, characterized N2 adsorption–desorption isotherms and BJH cumulative pore volume of the PW/SBA were investigated.