Chinese maximal-length phrases(maximal-length noun phrases and prepositional phrases) possess remarkable linguistic properties.Bidirectional labeling results of Chinese maximal-length phrases obtained using sequential classifiers reveal complementary properties in both directions.In this paper,both left-right and right-left sequential labeling were employed to identify the Chinese maximal-length noun phrases and prepositional phrases.Then a novel fork position based probabilistic algorithm was developed to fuse the bidirectional results.Experiments were carried out on the Penn Chinese Treebank,a segmented,part-of-speech tagged,and fully bracketed corpus.The results confirmed that the proposed algorithm is able to effectively exploit the complementary strengths of the two directions.