Given the shortness of magnetic field sensing scheme of LPFG and magnetofluid toward temperature change,the thesis prompts the sensing scheme which employs magnetofluid and two LPFG with different effective thermo-optical coefficients on cladding.Temperature variation was obtained by calculating the difference between the resonant wavelengths of two long period fiber gratings,and the result was afterwards corrected.Theoretical analysis shows that the relationship between temperature variation and the refractive index of magnetofluid and the resonant wavelength of long-period fiber gratings.The simulation system shows that: if the variation of external temperature is within 14oC,the gained relative error of temperature is 1.567%in maximum that the precision for magnetic field intensity increased at least 78.6476%than the sensing scheme of magnetic field adopting LPFG and magnetofluid.