Based on the theory of linear multidegreeoffreedom vibration,a linear three degreeoffreedom(3DOF) piezoelectric energy harvester was proposed and designed. The proposed harvester consists of one firstorder transmission beam, one secondorder transmission beam and a traditional single cantilever beam.The modeling and finite element simulation results show that the linear threedegreeof freedom configuration with the orthogonally bonded multiorder transmission beams can tune and reduce the resonant operating frequency efficiently.The measured frequency response derived from experiments indicates that the proposed harvester possesses three voltage peaks in the range of 0~100 Hz and 15 Hz of bandwidth.The measured results are consistent with the theoretical results.Moreover,comparing with the conventional harvester, the proposed energy harvester has lower operating frequency and 275% wider bandwidth than that of the traditional piezoelectric cantilever beam.