An implementation method, an operation method and a system of a data card driver free installation are provided. The implementation method includes following steps. Device side software of a data card is taken as a compound device with a HID function interface. The device side software of the data card maps all of other function interface data of the data card into the HID function interface, and takes the HID function interface as a channel so as to interact data with a PC side. An operating system of the computer automatically obtains and runs green software built in a storage area of said data card.