Mg

3

Sb

2

/Mg and（Mg

3

Sb

2

+AlSb）/Mg composites with a varied volume fraction of Mg

3

Sb

2

and Mg and（Mg

3

Sb

2

+AlSb）were prepared by in-situ reaction.The phase and morphology of the composites were analyzed by XRD and SEM.The hardness and mechanical properties of the composites were tested by microhardness tester and CTM universal testing machine.The electrochemical corrosion performance of the composites in 3.5% NaCl solution was measured by electrochemical workstation.The results show that the in-situ reaction method can fabricate Mg

3

Sb

2

/Mg and（Mg

3

Sb

2

+AlSb）/Mg composites with different volume fractions.In addition

the hardness

yield strength and tensile strength of Mg

3

Sb

2

/Mg composites can be improved significantly with the addition of Al.The corrosion potential of Mg-15.4 Sb-5 Al composite is-1.38 V

presenting the desirable corrosion resistance.The corrosion resistance of（Mg

3

Sb

2

+AlSb）/Mg composites is superior to that of Mg

3

Sb

2

/Mg composites.