A fiber micro structure temperature strain dual parameter measurement sensor based on singlemode-multimode-singlemode (SMS) optical fiber interference structure cascaded fiber Bragg grating (FBG) is proposed. Its strain characteristics and temperature characteristics were experimentally studied. The multimode optical fiber with a length of 35.5mm was fused between two singlemode optical fibers by means of optical fiber fusion to form a singlemode-multimode-singlemode optical fiber interference structure, and a temperature strain dual parameter measurement sensor was made by cascading FBGs. The results show that, in the strain range of 200~2000με, the strain sensitivity of singlemode-multimode-singlemode interference structure and FBG is -2.31 and 1.22pm/με respectively, and the linearity is 0.9992 and 0.9994 respectively. In the temperature range of 580~700℃, the temperature sensitivity of singlemode-multimode-singlemode interference structure and FBG is 58.79 and 13.64pm/℃ respectively, and the linearity reaches 0.9967 and 0.9982 respectively, which can realize simultaneous measurement of temperature and strain parameters.