Fiber grating technique has gained more and more applications in various fields with its rapid development. The wavelength reference is a very important part of fiber interrogator based on F-P, and it is a result of the standard in the interpolation. This paper mainly focuses on the characteristic and elements of the steady wavelength reference based on negative thermal expansion material ZrW2O8. Experimental analysis is done on its application in complete sets of instruments on account of the need of temperature changes.