Cosmic rays are charged particles originating from the cosmos, the sources, acceleration mechanism and propagation of which are of great interests to the studies in astrophysics. Cosmic-ray beryllium is the lightest pure secondary nuclei, produced by spallation of heavier cosmic-ray nuclei during their propagation in the interstellar medium and therefore carrying important information on this process. Particularly, 10Be has a half-life comparable with the time for cosmic rays to escape from the confinement of the Galaxy. The precision measurements of beryllium isotopes provide unique opportunities to probe propagation models. In this thesis, the measurement of the beryllium isotopic fluxes, from 0.51 GeV/n to 11.2 GeV/n, and the updated measurement of the cosmic-ray beryllium total flux, from 1.92 GV to 3.3 TV, based on events collected by the Alpha Magnetic Spectrometer during its first 8.5 years of operations on the International Space Station are presented.