The first-order Raman spectra of CdWO
4 crystal are measured at room temperature. The phonon disper-sion curves of CdWO
4 are calculated on the basis of a rigid-ion model using the measured frequency values. The first-order Raman spectra of external A
g mode (310cm
-1 and 550cm
-1) in the CdWO
4 crystal have been measured in the temperature range between 77 and 473K. The temperature dependence for the linewidth of the external A
g modes has been analyzed at 310cm
-1 and 550cm
-1 using the lattice dynamical perturebative treatment, and the calculated result agrees with the observed one in the temperature range of 77-473K. Thus, the temperature dependence of linewidth of the external A
g modes in CdWO
4 crystal is ap-proximately explained by the cubic anharmonic term in the expansion series of the crystal potential energy.
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