Variation of radial profiles of optogalvanie signals with the current, temperature and pressure in a CO2-discharged positive column has been investigated. An equation of the CO2 radial OGS is given, the radial distributions of electros density in CO2 positive column have been calculated. It was found that the distribution of electron density was converged to the axis of the column with rising pressure and current. The experimentel results are in agreement with the theory on gas dischkrge.