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We present a study of the spectroscopic binary TYC 2990-127-1 from the LAMOSTsurvey. We use full-spectrum fitting to derive radial velocities and spectralparameters. The high mass ratio indicates that the system underwent masstransfer in the past. We compute the orbital solution and find that it is avery close sub-giant/red giant pair on circular orbit, slightly inclined to thesky-plane. Fitting of the TESS photometrical data confirms this and suggests aninclination of i \sim 39.8 deg. The light curve and spectrum around H_alphashow signs of irregular variability, which supports ongoing mass transfer. Thebinary evolution simulations suggest that the binary may experiencenon-conservative mass transfer with accretion efficiency 0.3, and the binarywill enter into common envelope phase in the subsequent evolution. The remnantproduct after the ejection of common envelope may be a detached double heliumwhite dwarf (He WD) or a merger.

TYC~2990-127-1: an Algol-type SB2 binary system of subgiant and red giant with a probable ongoing mass-transfer