We propose a curvature sensing structure with low temperature sensitivity based on Mach-Zehnder interferometers (MZI),which is formed by large core-offset welding.As a core sensitive unit,GF3 fiber is welding with two sections of single mode fiber (SMF).The influence of core-offset and sensor length on temperature and curvature sensitivity is compared by experiments,respectively.Through these experiments,the optimal parameter combination to realize low temperature sensitivity curvature sensing is found.The experimental results show that when the sensor length is 10 mm and the core-offset is 20 μm,the temperature sensitivity of large core-offset MZI is only 0.9 pm/℃,and the curvature sensitivity can reach 10.9 nm/m-1 simultaneously.The sensor has the advantages of simple structure,low cost, high curvature sensitivity and low temperature sensitivity.It has potential application value in engineering structure,health monitoring and wearable device.