A method for preloading data in a CPU pipeline is provided, which includes the following steps. When a hint instruction is executed, allocate and initiate an entry in a preload table. When a load instruction is fetched, load a piece of data from a memory into the entry according to the entry. When a use instruction which uses the data loaded by the load instruction is executed, forward the data for the use instruction from the entry instead of from the memory. When the load instruction is executed, update the entry according to the load instruction.