Based on thermodynamics calculation f the end deoxidation of 100 kg 0. 15C-t. 36Mn steel liquid in medium frequency induction furnace is carried out respectively by added 1 kg AlFe

1 kg AlFe + feeding 0. 5 kg Ca wire

and 1 kg CaAl

2

. Results show that deoxidation rate of liquid by AlFe

AlFe + Ca and CaAl

2

is respectively 79. 3%

87.2% and 85. 0% ； with end oxidation by CaAl

2

the ratio of low melting point phases 12( CaO) . 7(Al

2

O

3

) and (CaO) • (Al

2

O

3

) • 2( SiO

2

) in slag obviously increases

and the CaO and Al

2

O

3

phase in liquid are on the decrease or trace

therefore the CaAl

2

has strong function to remove inclusions in steel.