The invention provides an intelligent operation system based on a personal computer (PC), comprising a key input device, a character object database, a functional object database, a processor and a display, wherein the key input device is used for inputting key commands; the character object database is used for storing character objects, and each character object is related with at least one key command; the functional object database is used for storing functional objects, and each functional object is related with at least one character object; the processor is used for enabling the PC to be under a desktop state, when the key command is input, the character objects related with the key command are output as candidates from the character object database according to the input key command, the functional objects related with the target character objects are output for selection and scheduling of a user from the functional object database according to the target character objects selected and output by the user from the candidate character objects; and the display is used for expressing the output of the processor. In the system, the character objects can be directly input under the condition of the PC desktop, a user operation intention is judged according to the input character objects and the quantity of character objects, and the functional objects related with the input character objects are searched, thereby facilitating the user to fast and correctly find the target functional objects; and when the quantity of character objects reaches a set value, the system defaults the user needs to schedule a text editor to edit the input words.