A new calculation model for L-vacancy deexcitation processes of heavy elements has been put forward. By using the model

Goldberg’s LX-ray intensity spectra produced by 50 keV electron impact on metallic elements and measured by a curved crystal spectrometer were analyzed

and the L-subshell fluorescence yields of ten elements ranging from Ta to Bi were obtained. The Present values of ω1

ω2 and ω3 are all in good agreement with the measurements reported in recent years

but different evidently from Krause’s semiempirical compilation for elements around Z = 80. The new ω1 values are about 20% more than the compiled and about 55% more than the last theoretical data for elements around Z=80.