Аннотация:One of the important sources for independent determination of stellar masses are eclipsing binaries with components on theMain Sequence, and with observable spectral lines of both components. The parameters of such stars are used to constructthe mass-luminosity relation for stars of high and intermediate masses. Among them, the type of long-period eclipsingbinaries stands out, the parameters of which are currently not fully determined, which is associated with the difficultiescaused by the need for long-term observations. In this article we will review the currently available observational data forsuch objects and discuss the prospects for their use to determine stellar masses.