Excitation and fluorescence spectra of SrTiO

3

:Cr

3+

crystal were measured at 63 K and 9 K respectively. The crystal-field energy levels of Cr

3+

in SrTiO

3

crystal were calculated according to Tanobe-Sugano energy matrices and the experimental results.The sample was grown in reduction atmosphere using melt method

which contains nominally 0.01 Wt.% Cr

2

O

3

. A 1-mm-thick

polished sample

which was annealed at 660℃ for one to two minutes in air

was used in the experiment. Annealing the sample in air reduces the oxygen vacancies and increases Cr

4+

concentration.The crystal-field strength parameter

D

9

and Racah parameters B and C obtained were 1626

471 and 2992cm

-1

respectively. The ratio

D

q

/

B

=3.46

>

2.3cm

-1

means that SrTiO

3

crystal belongs to strong field material. The red shift of R line ralative to other Cr

3+

-doped crystals is about 100 nm. So large red shift was explained to be due to the strong covalence of the SrTiO

3

crystal.