We calculated the radiation force on atoms in an isotropic light produced by an integrating sphere. Then we present a new scheme of atomic beam slowing by 5 integrating spheres which are arranged in series with detuning of laser and atomic transition frequency from -70Γ to -10Γ respectively. The numerical results show that we can capture the atoms with velocity less than 331 m/s, and slow them down to less than 1 m/s, close to the Doppler limit.