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This paper presents the novel synthesis design of a three-degree of freedom silicon piezoresistive accelerometer. The purpose of this novel synthesis design is to achieve the high performance device. The design synthesis has been performed based on considerations of mechanical and electronics sensitivities, noise and thermal effects, respectively. The mechanical sensitivity is optimized due to combination of a FEM software and a MNA one. The electronics sensitivity, noise and thermal effect can be determined by thermal, mechanical and piezoresistive coupled-field simulations. The dimension of sensor is as small as 1.5 mm2, so it is suitable for many immerging applications.