(Ba_0.3Sr_0.7)_0.35(Bi_0.5Na_0.5)_0.65TiO₃-xwt%CaCu₃Ti₄O₁₂ (BSBNT-xwt%CCTO, in which x=5, 10, 15, 20) ceramics were prepared by a solid-state reaction method. The effect of CCTO content on the phase structure, microstructure and electrical properties was investigated. The ceramics possess a coexistence of BSBNT and CCTO phases when x≤15, while a few Cu_xO_y phase can be detected when x=20. The grain size of ceramics decreases significantly corresponding good density after CCTO addition. Meanwhile, the dielectric peak becomes broadened, the temperature stability TCC_{150 ℃} is enhanced, and the dielectric constant and loss also display good frequency stability. As CCTO content increases, the P-E loops of BSBNT-xwt%CCTO ceramics gradually transform to “slim” type. For BSBNT-10wt%CCTO ceramics, the optimized energy density W_rec=0.72 J/cm³ is achieved with an efficiency η=63.4% under an electric field of E=80 kV/cm, which can be used for pulsed power capacitors fabrication.