In order to investigate the temperature and refractive index sensing performances of fiber optic SPR sensors with different heterogeneous core structures, reflective fiber optic SPR sensors based on multimode fiber (MMF)-single mode fiber (SMF), MMF-no core fiber (NCF), and MMF-hollow core fiber (HCF) structures were prepared respectively. By coating a temperature-sensitive film on about half of the surface of the fiber optic probe, the simultaneous measurements of the refractive index and temperature can be achieved. And the temperature and refractive index sensing characteristics of the three probes are compared and analyzed. In this paper, the finite element method is used to analyze the sensor's temperature and refractive index dual parametric sensing principle, and the sensing characteristics of the three structures of fiber-optic probes are analyzed and compared by experimental methods. The experimental results show that among the three heterogeneous fiber optic probes, the HCF-based reflective SPR sensor has the best temperature and refractive index sensing performance. In the temperature measurement range of 30-70 ℃, the temperature sensitivity is about -1.6045 nm/?C, and a refractive index sensitivity of up to 1945.46 nm/RIU is obtained in the refractive index range of 1.331-1.37.