Abstract
Abstract In this paper, the orbital period change of the RS CVn-type binary system WY Cnc is analyzed through a detailed description of the $O-C$ curve by a weighted least-squares method. It is found that the period variation is suffering a secular period decrease at a rate of $dp/dt$$=$$-$1.20 $\times$ 10$^{-7}$dy$^{-1}$. Since WY Cnc is a typical detached binary system, and both components are late-type stars, the long-term period decrease may be caused by angular momentum loss via magnetic braking.
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