A computer platform memory access control method and system is proposed, which is designed for use with a computer platform, such as a network server, for providing the server with a memory access control function with a memory configuration automatic setting capability, which is characterized by the arrangement of a configuration data exchange path between a memory control chip and an I/O control chip on the server's motherboard, so as to allow a set of memory specification data stored in an I/O configuration register of the ICH I/O control chip to be mapped via the configuration data exchange path to a memory configuration register of the memory control chip, such that a memory access action can be performed based on the memory specification data mapped from the I/O control chip. This feature allows the operation and network management of servers to be made more efficient.