The measurement of open charm production in various collision species at different energies is important to study the properties of matter formed in the early stage of relativistic heavy ion collisions, especially to understand charm energy loss and recombination systematically. PHENIX detectors measure muons in the rapidity range $1.2 < | \eta | < 2.4$, thus enabling us to study open charm as well as light meson production at forward rapidity. Preliminary PHENIX results and the current status of these analyses will be presented.