NbCr2 alloys of Laves phase were prepared by mechanical alloying and hot pressing, and the influences of Al on the microstructure and mechanical properties, especially fracture toughness, of NbCr2 alloys were studied. The results show that the alloying element Al mainly exists in the Cr site in the NbCr2 Laves phase. The hardness of NbCr2 alloys increases slightly with the increase of Al adding amount, but no obvious effect on the fracture toughness for the NbCr2 alloys. At a higher Al adding level (i. e. 12 at%), the fracture toughness of the NbCr2 alloy is 6.8 MPa, a higher value than that of the cast alloys (1.2 MPa m1/2)