Magnetic hysteresis measurement on sintered Bi(Pb)SrCaCuO specimens consisting mainly of the 110 K phase and those partially or mainly containing the 80 K phase was performed. Their temperature and magnetic field dependences were compared in terms of the flux pinning behavior. At low temperatures near 4.2 K, magnetic hystereses were comparable to that observed in sintered Ba 2 YCu 3 O 7 and persisted, without significant degradation, up to 9 T. This suggested that the critical current density, J c , can be intrinsically quite large. However, as the temperature was increased, the hysteresis and the corresponding J c drastically decreased, possibly indicating its characteristic flux-lattice softening or melting behavior. In order to overcome this difficulty, we have examined doping of foreign ions such as Mg and Nb and found indications of clear improvement in the temperature and field dependence of the magnetization hysteresis