Abstract: A portable computer with a speech recognition function and the method for processing a speech command thereof is disclosed. In the method of a speech command, the speech command has Y command character strings, wherein Y is a positive integer and which is greater than or equal to one. The method includes a step: providing a plurality of speech recognition databases and loading a corresponding speech recognition database responding to execute the X-th command string of the speech command, wherein X is a positive integer and is greater than or equal to one and is less than or equal to N. When the string corresponding to the X-th command character string is found in the loaded speech recognition database, an operation designated by the X-th command string is executed, and when X is not equal to Y, one is added to X.