Abstract: Island-like oxidation of uranium surface corrosion was studied with theoretical modeling. The reaction rate of uranium and alloys from its initial stage to the surface fully covered by oxide was simulated. Mathematic formulation of the problem was pre- sented, and approximate analytical formulas were derived and discussed for the isothermal case. The kinetic formula under isothermal condition was achieved, and it is consi- dered reasonable that the numerically results of modeling are in accordance with that of experiments.