According to the HeII lines, Zanstra temperatures were calculated of the central stars of planetary nebulae NGC 2392, NGC 1535, IC 418, NGC 3242. Respectively, the tempera-tures of 83596 K, 70079 K, 44061K and 87858 K were found for the central stars. The flux in the HeII radiation line used in the calculations have determined from the spectra taken from the archive of the European Southern Observatory. With this aim, were pro-cessed the spectra of the studied nebulae, energy distribution curves in absolute flux units according to magnitude were constructed in different filters (UBVR), determined the equivalent widths of the HeII lines and the values of the fluxes in the continuum near the line. The temperatures obtained from the calculations are listed in comparison with the temperatures obtained by other authors.