The electron accelerator URT-1М-300 for mobile installation was created for radiation disinfecting of clothes, footwear, documents and personal belongings from pathogenic microorganisms in field conditions to correct drawbacks that were found the URT-1M electron accelerator operation (the accelerating voltage up to 1 МV, repetition rate up to 300 pps, electron beam size 400´100 mm, the pulse width about 100 ns). Accelerator configuration was changed that allowed to reduce significantly by 20 % tank volume with oil where is placed the system of formation high-voltage pulses, thus the average power of the accelerator is increased by 6 times at the expense of increase in pulses repetition rate. Was created the system of the computerized monitoring parameters (output parameters and thermal mode) and remote control of the accelerator (charge voltage, pulse repetition rate), its elements and auxiliary systems (heat of the thyratron, vacuum system), the remote control panel is connected to the installation by the fiber-optical channel, what lightens the work for service personnel. For receiving an electron beam of big width (to 400 mm) was used the metaldielectric cathode from several elements cathode to make not more than ~15 % non-uniformity distribution of beam current density on the outlet foil. For X-rays radiation mode generator was created the multilayered anode consisting of the tantalic convector, an aluminum framework and a thin layer of cooling water (2mm). The accelerator can be used for the radiation technologies in layers by thickness up to 0.3 g/cm 2.