Phase transition and dielectric properties of La-doped Pb(Zr,Sn,Ti)O3 antiferroelectric ceramics under hydrostatic pressure have been studied, and effects of temperature on the pressure-induced phase transition and the dielectric property dependence on the applied hydrostatic pressure have been investigated. The ferroelectric-antiferroelectric phase transition pressure is decreased with increasing temperature, these phenomena are helpful for understanding of the behaviors of pressure-induced dielectric frequency dispersion and diffuse phase transition.