  The temperature dependence of BGO coupled with photomultiplier tube R5610A-01
was studied in the range of -30{\deg}C~30{\deg}C. The temperature coefficient
of the BGO and R5610A in whole was tested to be -1.82%. And the temperature
coefficient of the gain of the R5610A is -0.44% which was tested in the same
situation using a blue LED. Thus the temperature coefficient of BGO's light
yield can be evaluated as -1.38%.
