Thermal expansion properties of Fe-based nanocrystalline Fe１３．５Ｃｕ１Ｎｂ３Ｓｉ１３．５Ｂ９ and Ｆｅ９１Ｚｒ７Ｂ２ alloys are studied, and are compared with that of the amorphous alloys with the same composition. The experimental results indicated that, below Curie temperature, the thermal expansion coefficients of the nanocrystalline alloys are much greater than that of the amorphous alloys, and above Curie temperature, the thermal expansion coefficients of the nanocrystalline alloys exceed that of the amorphous alloys a little. We believe that the difference of the thermal expansion between Fe-based nanocrystalline and amorphous alloys is related to the Invar effect.