In the paper, we suggest a proposal that if n sections of the superconducting hollowed cyllinder which has been longitudinally cut are put into n longitudinal field coils for Tokamak apparatus, electric power of longitudinal field coils can be reduced to 2/n by sectional freezing of toroidal field,It is well known that freezing field Hfj of Superconducting material may be expressed approximately by the following equation: Hfj(r,T)=/Hfj(r, 0)[1-(T/Tc)2] Consequently, if we select that T = T1, the critical field will be reached at the internal wall of the superconducting hollowed cyllinder and magnetic field will go into it when the magnetic field reaches Hin≥ Hfj(r,T1). Then the magnetic field H will decrease to zero and the temperature will also decease to T2 which is far below the temperature T1. Thus this hollowed cyllinder can't be effected when magnetic field is being freezed in the neighbonring superconducting hollow cyllinder.Since electric power required is decreased by 2/n times, the power supply of middle sized apparetus operating at present is sufficient to provide power reactor.Since superconducting hollowed cyllinders with freezed magnetic field Hfj(r, T1) are put at temperature T2, after plasma is built it also can well equilibrate and stabilize plasma together with equilibrating field and feed backing field. Not only the role of Copper shells for equilibrating and stabizing plasma may be largely expanded by the combination of sections of the superconducting hollow cyllinder and copper shells with toroidal cuts in the internal wall, but also the thickness of copper shell can be decreased.Although electric power required for freezing toroidal field is greater than the power required by superconducting solenoidal magnet, however the local rise of temperature caused by the small mechanical movement of conductor due to the much large electromagnetic force in the superconducting magnet can be avoided.