The results of spectral observations of the Algol-type binary star U Sagittae (U Sge) are presented. The behavior of profiles: hydrogen lines of the Balmer series (H-H) and HeI 5876A0, as well as lines of resonance doublets – DNaI and KCaII, during the orbital peri-od of the eclipsing binary system U Sge, is described. Radial velocities of the hydrogen lines (H-H) and HeI 5876A0, were measured. Based on these measurements radial velocity curve of the main component of the U Sge system were constructed. Value of phases about 0.8 in the blue and about 0.3 the red wing of the absorption line Н an additional absorption detail appears. Our preliminarily assumption is that this observa-tion may be due to the fact that the H alpha line is also visible on the secondary com-ponent at the beginning and end of the eclipse, and it is not excluded that this is related to the so-called of effect Mclaughlin of Rossiter or this absorption line are linked to supposed 3rd component.