  We propose new formulas for extracting a difference of the polarized light
sea-quark density, $\Delta\bar d(x)-\Delta\bar u(x)$, from polarized
deep-inelastic semi-inclusive data. We have estimated the value of it from the
present experimental data measured by SMC and HERMES groups. Although the data
might suggest a violation of polarized light flavor sea-quark symmetry, the
precision of the present data is not enough for confirming it.
