The aim of this paper is to analyze and describe the morphological and syntactic structure of the Lahu language spoken in Chiang Rai area, Thailand. Lahu is one of the hill tribe languages spoken in Thailand, Myanmar, China and Laos, and has been classified as belonging to the Lolo-Burmese branch of the Sino-Tibetan language family. Four Lahu speakers, two men and two women, speaking black Lahu, served as informants for this study in a series of field works conducted by the author in 1995-97. It was found necessary to set up seven parts of speech in Lahu, i.e. Noun, Verb, Particle, Classifier, Adverb, Conjunction and Interjection, on the basis of the syntactic function of words and morphemes. An Nominal and Verbal phrases and clau...