In present paper, the spontaneous emission of an emitter in the inhomogeneous mediums beyond dipole approximation is studied. According to Purcell effect, the spontaneous emission rate is not an intrinsic feature of the emitter whereas it depends on boundary and local modes. In the present research the role of surface plasmons on the spontaneous emission rate beyond dipole approximation is investigated. The physical model is a single quantum dot which is placed in proximity of a spherical metal nano particle and an infinite cylinder rod. Our results demonstrate that the spontaneous emission rate of the quantum dot depends on the shape of conductor and distance from metal bodies. Moreover, the dipole orientation and the size of quantum dot possess important roles in the spontaneous emission rate evolution.