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This paper analyzes the first secured four color light curves of V396 Monusing the 2003 version of the WD code. It is confirmed that V396 Mon is ashallow W-type contact binary system with a mass ratio $q=2.554(\pm0.004)$ anda degree of contact factor $f=18.9%(\pm1.2%)$. A period investigation based onall available data shows that the period of the system includes a long-termdecrease ($dP/dt=-8.57\times{10^{-8}}$ days/year) and an oscillation($A_3=0.^{d}0160$; $T_3=42.4\,years$). They are caused by angular momentum loss(AML) and light-time effect, respectively. The suspect third body perhaps is asmall M-type star (about 0.31 solar mass). Though some proofs show that thissystem has strong magnetic activity, through analyzing we found that theApplegate mechanism cannot explain the periodic changes. This binary is anespecially important system according to Qian's statistics of contact binariesas its mass ratio lies near the proposed pivot point about which the physicalstructure of contact binaries supposedly oscillate.

Period changes and four-color light curves of the active overcontact binary v396 monocerotis