Knockout reactions at intermediate and high energies have been proved to be a powerful tool for probing thesingle-particle structure of rare isotopes[1]. The spectroscopic factors and orbital angular momenta of the removednucleons can be deduced by comparison of the experimental cross sections and longitudinal-momentum distributionsto those calculated in the Glauber reaction theory. Recently, study shows that for strongly bound valence nucleonknockout, the experimental cross sections are much smaller than reaction theory predictions[2].