Abstract: A Chinese error check system comprises: an input device for inputting a sentence to be checked; a regular dictionary storing device for storing regular words and their weights; a special segmentation classes storing device for storing special segmentation classes and their weights; a segmentation device for segmenting an inputted sentence by retrieving the contents of the regular dictionary storing device and the special segmentation class storing device and employing a dynamic programming method to select a most probable segmentation of the inputted sentence; a lone character bigram table storage device for storing the lone character bigram table, the table having the probability of Chinese character pairs being adjacent lone character pairs stored therein; and a segmentation results processing device operatively coupled to the lone character bigram table storage device and the segmentation device for processing the segmentation results and displaying possible errors in the inputted sentence.