The splitting of singular autowave propagating in reaction-diffusion B
elousov-Zhabotinsky system have been experimentally detected. The effe
ct was initiated by the sharp removing of oxigen from a gas phase abov
e the reactional mixture. It was demonstrated that the phenomenon is d
etermined by oxigen influence on the anisotropy of excitability in Bel
ousov-Zhabotinsky system.