In order to analyze the internal relationship between the resistivity of Fe-Mn-Si shape memory alloy（SMA） and the austenite（γ）→ε martensite phase transformation and its reverse transformation， means of dynamic resistance measurement system， X-ray diffraction（XRD）， metallographic microscope and other methods were used to measure and observe the resistivity， phase composition and microstructure of Fe-Mn-Si memory alloy during tensile and heating process. The test results show that during the 0%-7.0% tensile strain of the Fe17Mn5Si10Cr5Ni memory alloy， the resistivity of the alloy increases with the increase of the tensile strain. During the γ→ε martensite phase transformation， the increase range of resistivity increases， and is consistent with the change law of the content of ε martensite. During the heating and cooling process of the 5.0% tensile strained Fe17Mn5Si10Cr5Ni memory alloy sample， the alloy resistivity has a positive correlation with temperature. During the γ→ε martensite reverse phase transformation， the increase range of the alloy resistivity decreases as the content of ε martensite decreases.