Photophoretic motion of the large high-viscose spherical drop (no matter circulation inside the particle and no forces of interphase surface tension) inside a viscose binary gas mixture at small relative temperature gradients therearound is theoretically described. In a quasistationary approximation, a system of hydrodynamic equations (the Navier-Stokes equations system) and convective equations of heat and mass transfer at small Reynolds and Peclet numbers have been solved. The obtained formulae allow evaluate the contribution of heat and mass transfer, thermal diffusion and direct impact of the evaporation rate on the photophoresis rate, distribution of velocities, temperatures and concentration of a volatile component. It is shown that for highly thermal conductive particles there is photophoresis due to convective heat and mass transfer. Keywords: photophoresis of drops, motion of highly-viscose drops in gas, motion of drops in the electromagnetic radiation field, heat and mass exchange.