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   61022
   We propose the observations of the eclipsing massive Wolf-Rayet
   binaries CV Ser and CQ Cep. We observe these sources at three different
   orbital phases: 0(W-R is front), 1/4 and 1/2(O is front). We try to
   detect the spectra from the thin thermal plasma with a phase-related
   variable absorption, which is very useful for the establishment of the
   universal senario of massive W-R binaries. On the basis of this
   senario, we are going to measure abundances of W-R wind material using
   the plasma temperature and absorption. We also search the wind
   accelarating regions near the W-R surface.
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