Titan, the sixth satellite of Saturn, possesses high density atmosphere, involving mainly nitrogen, hydrogen, as well as various hydrocarbons. External energy flux provokes distinctive photochemical processes terminating in the formation of higher hydrocarbons knowing as tholins . The latter consist of (among others) such homologous families as polyacetylenes, vinylacetylenes, polyvinyls, etc. In a physical sense tholins present the smallest particles of initial size equal to tens of Angstroms. They form the spatial domain of thin two-phase haze which is located approximately on the altitude's range 50-200 km. Being once generated as the smallest germs, tholins thereupon begin to grow up to the thousands mkm and eventually sediment on Titan's surface. Thus the polymer rains occur in Titan's atmosphere.Primary germs enlarge due to both chemical ( pure growth of hydrocarbon chain) and physical (sticking) reasons. In the first case the final big particle formed is in fact one giant molecule of individual chemical substance, while in the second case it presents a mixture of lower members of different families. Setting the very nature (polymerization, telomerization, oligomerization, polycondensation, etc.) and kinetic model of chemical activity, the physical model of germs enlargement (coalescence, coagulation, etc.) and model of sedimentation, one can find all the features of aerosol behavior in Titan's atmosphere.It was shown that the kinetic model of telomerization consisting of 46 components and 148 elementary reactions, physical coalescence/coagulation mixed model of germs grow and simplified one-dimensional Stocks model of sedimentation present the valid statement of the problem analyzed. Systematic qualitative analysis and numerical simulation reveal the limits of spontaneous telomerization, specific chemical and physical times, relative amounts of different chemical items depending on physical conditions of process, the distribution of components along the altitude and a lot of other peculiarities of the process.