Abstract: Magnetically controlled shape memory alloy (MSMA) is a kind of new functional material with reversible properties, which can be used to develop MSMA sensor. Based on the theoretical analysis, the finite element analysis software of Ansoft Maxwell is used to simulate the each parts of the MSMA sensor respectively. The MSMA sensor, which has structure and shape optimization, is design in this paper,optimized sensor can improve its performance. By experimental study, the effectiveness is verified about MSMA sensor optimization, the research works lay a technical foundation for modeling and application of MSMA sensor.