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The first B-, V-, Rc-, and Ic-band light curves of CSS J022914.4+044340 arepresented and analyzed. It is found that CSS J022914.4+044340 is a low massratio (0.198 +- 0.005) deep (63.7 +- 7.9%) contact binary, indicating that ithas been already at the end evolutionary stage of tidally-locked evolution viamagnetized wind. Because of the totally eclipsing character, the photometricsolutions are reliable. The temperature and the metallicity are determined fromthe spectroscopic data as T = 5855 +- 15 K, and [Fe/H] = -0.842 +- 0.031,respectively. Based on the parallax of Gaia EDR3, the physical parameters ofCSS J022914.4+044340 are estimated as M1 = 1.44 (+0.25,-0.22) solar mass, M2 =0.29 (+0.05,-0.05) solar mass, R1 = 1.26 (+0.08,-0.06) solar radius, R2 = 0.65(+0.03,-0.04) solar radius, L1 = 1.718 (+0.186,-0.191) solar luminosity, L2 =0.416 (+0.039,-0.050) solar luminosity. Combined the fraction in light of thethird body via the photometric solution (54%), the luminosity of the third bodyis estimated as 2.705 solar luminosity. The third body may be inferred as asubgiant. Thus, it is explained that why the primary component of CSSJ022914.4+044340 has higher mass among the similar systems, and why itsmetallicity is so poor.

The Deep and Low-Mass-Ratio Contact Binary CSS J022914.4+044340 with A Luminous Additional Companion