A mounting apparatus is configured for securing at least one PCI card, and includes a chassis, a bracket, a positioning member, and a locking member. The chassis includes a bottom plate and a side plate perpendicular to the bottom plate. The bracket is secured on the bottom plate. The positioning member is secured on the bracket. The positioning member includes a securing plate perpendicular to the chassis side pate and parallel to the chassis bottom plate. The locking member is secured on the securing plate of the positioning member. The locking member includes a limiting plate parallel to the securing plate. The at least one PCI card is located between the limiting plate and the securing plate to secure the PCI card(s) in the chassis.