NHT/Fe3O4 composite particles with fairly low saturationmagnetization were prepared by in-situ co-precipitation method in this work, then these composite particles were dispersed in non-magnetic base oil to prepare weakly magnetic organogel. Experimental results testify that this organogel is magnetic sensitive and reveal an obvious shear-thinning behavior and structural recover ability under shear and magnetic field. Afterwards, ferromagnetic particles were mixed into above organogel to make magnetorheological fluids. By performing a comparative study of MRFs based on different carrier, enhanced magnetorheological performances and suspension stability of MRFs based on weakly magnetic organogel were confirmed. Besides, MRFs based on weakly magnetic organogel have significantly increased shear stresses and yield stresses especially in the presence of magnetic field. A point-dipole model is applied to explain above experimental phenomena, the possible reason is that composite particles squeeze into field-induced chains driven by hydrodynamic force and magnetostatic force therefore apply additional forces on ferromagnetic particles. Under such circumstance, stronger and more cross-linked field-induced microstructures are established, as a result, leading to enhanced magnetorheological performances macroscopically. Besides, microstructures formed by composite particles impose the gap among ferromagnetic particles thus hinder their direct contact and aggregation. Hence, an enhanced suspension stability of MRFs based on weakly magnetic organogel was also observed in this work.