To study the characteristics of medical proton beam produced in the interaction of femtosecond pulse laser with solid targets,the proton beam behavior at the normal direction of the rear surface of the solid targets produced from ulintencity pulse laser was explored on SILEX-I laser facility.The spatial distributions of the proton beam with different target thicknesses were recorded by radiochromic film(RCF) HD810.The density and yield of the proton beam were recorded by nuclear track detector C...