The GaAs quantum ring energies and sizedependent effect are studied by Bspline technique in strong magnetic field. The calculated results show: In the strong magnetic field （B>3T）

ground state energies E1 and absolute value of Coulomd energy EC increases with magnetic field strength 〖WTBX〗B〖WTBZ〗，and the distance between E1-B curves of different angular momentum（m=-1

-2

-3）are pulled apart by Coulomd field of positive charge placed in the center; As quantum ring radius r0 increase

every E1-r0 curve has a minimum position r00

which decreases as the magnetic field strengthB increasing

and the distance between E1-r0 curves in different magnetic field strength Bare pulled closely by Coulomd field of positive charge placed in the center; The absolute value of Coulomd energy EC decreases linearly as the magnetic field strength B increasing. The ground state energies E1increase with harmonic potential ω0

the E1-ω0 curves of different angular momentum（m=-1

-2

-3） cross each other under the impact of Coulomd field，which lead to a change of the energy levels in the order. The absolute value of Coulomd energy EC decreases nonlinearly as ω0 increasing.