Martensite  stainless  steel  2Cr13(0. 19C

12.88Cr)was  melted  by  a  vacuum  non-consumable  arc  fumace and 0~0. 18%  Ce was  added  in  casting  ingot.The morphology  and  ingredient  of inclusion  in  steel was  observed  and  analyzed by using optical and scanning electron microscope and X-ray energy dispersive spectrometer.Results showed that with  no-adding rare-earth element Ce the inclusion in steel was irregular MnS

Cr

2

S

3

and FeS compound inclusion with dimension  19.33  μm

with  added  0. 14%  Ce  the  inclusion  in  steel  was  compound  rare-earth(RE)inclusion(inner  RE  sulphide  and  outside  RE  silicate)approximated  ellipsoid  with  dimension  18.64   μm  and  with  added  0. 16%～0. 18%  Ce  the  inclu sion  in  steel  was  ellipsoid  or  spheroid  RE  silicate  with  dimension7.69~8.15  μm.