Tibetan language input system and method

The invention relates to a Tibetan input system and a method thereof. The system comprises an input device which comprises ten input keys at least and is used for inputting an instruction of a target input key and a keyboard definition module which comprises at least ten storage units. Each storage unit is corresponding to an input key, is stored with a set of following Tibetan list separator or letter (see a lower right chart) processor and is used for taking out a Tibetan letter corresponding to the target input key in the keyboard definition module according to the input instruction of the target input key; the target Tibetan is input into a target program after target Tibetan is searched from a Tibetan word stock according to the taken-out Tibetan letter. The system also comprises the Tibetan word stock which is used for storing the Tibetan. The system and the method realize the function of inputting the Tibetan by a small keyboard.