[en] Results of measurements of neutron mean total cross sections and factors of resonance self-shielding of total cross section and fission cross section in the 2eV-20keV energy range by the neutron transmission and self-indication method for ²³⁵U and ²³⁹Pu are presented. Transmission function T(x) and fission self-indication function Tsub(f)(x) were measured from time of flight by the neutron spectrometer on the base of IBR-30 pulse fast reactor. Counters with ³He were used as neutron detectors in measurements of transmissions T(x). Resolution constituted approximately 100 ns/m. Fast response multilayer fission chambers with uranium and plutonium layers serve as self-indication detectors layer thickness and total amount of ²³⁵U constitute 2mg/cm² and 2g, for ²³⁹Pu - 0.5 mg/cm² and 0.5g, correspondingly. Fragment registration efficiency in the fission chambers were measured in separate resonances and amounted to 50-70%. Resolution in self-indication measurements Tsub(f)(x) is 53 ns/m. Specimens represent disks of metal uranium (with 10% ²³⁸U content) and plutonium 50-80 mm dia in sealed stainless steel cans. The correction for ²³⁸U was calculated from parameters obtained as a result of transmission processing. In the course of measurements inherent detector background was controlled. The data obtained are compared with calculational results published earlier. It is noted that the spread in various evaluations of resonance self-shielding factors is rather big. Data on factors of cross section resonance self-shielding for ²³⁵U and ²³⁹Pu at the energy above 1 keV are systematically lower as compared to calculated values. Considerable exceeding of values obtained in experiments as compared to estimations obtained by using the BNAB group constants system, takes place also for the factors of resonance self-shielding of ²³⁹Pu fission cross section