(1-x)（Ba0.85Ca0.15)( Zr0.05Ti0.95)O3-xYMnO3(BCZT YMn） lead free ceramics were prepared by the traditional solid state reaction method. The effect of YMnO3 doping on the phase structure and dielectric properties of the ceramics was studies. The results showed that the ferroelectric properties were improved during phase transition. The optimum ferroelectric properties (the remanent polarization was 18.03 μC/cm2 , the coercive field was 0.9 kV/mm, the room dielectric constant was 3 375, the maximum dielectric constant m was 3 507) were obtained at x=0.060 while the electric field intensity was 4 kV/mm. The ferroelectricity mutations disappeared and the curie peak was broaden at x>0.060. At the same time, the curie temperature was shifted.