Mental causation is one of the major problems in the philosophy of mind. It is a big problem not only for dualism but also for physicalism because even physicalists, as long as they accept the multiple realizability of mental properties, cannot identify mental properties with physical properties, therefore, they seem to be forced to exclude mental properties from physical causal relations. Sydney Shoemaker recently proposed interesting metaphysics of properties as a physicalist solution to this problem. According to Shoemaker, causal powers are essential to properties, and a realized property is a part of its realizer. This paper aims to assess the possibility of a physicalist solution to this problem through a critical examination of the adequacy of his solution.