In this peper the fluorescent spectra properties of Bi

3+

and Eu

3+

in Y

2

O

3

-Bi

2

O

3

system and the regularities of their variation are reported.The fluorescent spectraof Bi

3+

show an emission band at about 5100Å under 3300Å excitation. The emis-sion intensity enhances with the reduction of the Bi

3+

content.Under 3500Å excitation. the Eu

3+

in Y

2

O

3

-Bi

2

O

3

system gives a brigher red emission and the fluorescent intensities at about 6110Å corresponding to

6

D

0

-

7

F

2

transition are stronger than that in Eu:Y

2

O

3

system. In (Y

1-

X

-0.143

Eu

X

Bi

0.142

)

2

O

3

phosphor

the fluorescent intensities of Eu

3+

enhance and that of Bi

3+

decreases with the increaes of the Eu

3+

concentration. No Eu

3+

concentration quenching is observed until x=0.20mol. These indicate that energy transfer from Bi

3+

to Eu

3+

occurs.