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We carried out intensive spectroscopic observations of two WZ Sge-type dwarfnovae, GW Lib, and V455 And during their superoutbursts in 2007, at 6observatories. The observations covered the whole of both superoutbursts fromthe very maximum to the fading tail. We found evidence of the winds having aspeed of $\sim$1000 km s$^{-1}$ which blew in GW Lib during the rising phase.The evolution of the hydrogen, helium, and carbon lines suggests flaring of theaccretion disk and emergence of the temperature inversion layer on the disk.

Spectroscopic Observations of WZ Sge-type Dwarf Novae, GW Lib and V455 And in Superoutburst