The 0.7BiFeO(3)-0.3(Ba0.85Ca0.15)(Zr0.1Ti0.9)O-3+x wt.% MnO2 (x = 0.0-0.7) multiferroic ceramics were fabricated by a solid state reaction method. Effects of Mn doping on phase structure, microstructure, dielectric, ferroelectric, and magnetic properties were systematically investigated. It was found that all ceramics showed pseudocubic phases. Dense microstructure along with perfect grains and clear grain boundaries were obtained in all ceramics. A relaxor behavior was observed in all ceramics and Mn doping could promote this behavior. In the case of Mn modifying, significantly lower dielectric loss values along with higher T, could be obtained compared with un-doped system. The lower leakage current density J values and relatively higher resistivity R values showed that better electric insulation was achieved by Mn modification. The optimal ferroelectric and magnetic properties were obtained at proper amount of Mn modification with x=0.2-0.4. (C) 2016 Elsevier Ltd. All rights reserved.