Abstract: A Chinese language input form based on keyboard combination of words and sentences is proposed, using word collocation, semantic association, fixed collocation and sentence patterns in the recognition of homophonic words. Rules (including the morphological, rule of separated words, rule of word collocation and obligatory relations between adjacent words etc.) that are positive are first applied to reduce the range of recognition of homophone words. Then the less conclusive factors are synthesized to arrive at the optimal sentences by way of evaluating functions.