We have conducted a systematic study of the surface brightness distribution for bright (V606 ≤ 23.5) face-on (b/a > 0.4) spiral galaxies at z~0.5-1. The sample was extracted from the HDF-N, HDF-S and HUDF and it consists of 117 spiral galaxies with available redshifts. Major and minor axes surface brightness profiles in the I band were investigated. In accordance with previous studies, we have found that most distant disks cannot be described by single exponential model. About 20-30% of galaxies demonstrate downbending profiles with mean break radius at 1.8 h1 (h1 - exponential scalelength of the inner disk). In agreement with Trujillo & Pohlen (2005), we have found that the break radius of distant galaxies correlates with their luminosity. From comparison of the correlations for local and distant galaxies, we confirm that radial position of the break radius evolve with redshift. This evolution is in qualitative agreement with results of numerical simulations for star-forming viscous disks under extended gase