A type of portable computer with interchangeable components is provided. The chassis of the portable computer includes an upper part, a lower part, and an edge part. The edge part can be equipped with removable input and output (I/O) plates. The motherboards and batteries of this type of portable computer are standardized with or without optional components such as optical drives and/or 2.5 inch hard drives. Motherboards, batteries and other components can be mounted in the chassis of the portable computer through fixed mounting stands and/or removable mounting standoffs. The portable computer allows the I/O plates and/or the edge part to be replaced. Therefore, a motherboard with different I/Os, a motherboard and other components with different heights, and an auxiliary cooling system can be installed in the chassis. In the portable computer, mounting stands and standoffs can be shared by multiple components.