Clausal nominalization is unmarked in Meiba Bai,while lexical nominalization is mainly marked by three nominalizers,namely nɔ44,ȵi21 and tsh(υ)31.The nominalizing function of nɔ44 is developed from its functions as modifier and relative markers,thus their distributions and meanings are closely related.The nominalizer ȵi21 is directly grammaticalized from the classifier ȵi21.The classifiers that are used to modify human nouns(i.e.,tɯ21,pa35 and xuɔ33)all have the function of nominalization,but are less frequently used than ȵi21.ȵi21 seems to overlap with nɔ44 in nominalizing arguments of verbs,but they are distinctive in function.ȵi21 is only used in agent nominalization,while nɔ44 can be used in nominalizing different arguments.Even when they are both used in agent nominalization,their referents are different in definiteness.The lexical meaning of tsh(υ)31 is'a place'.As a nominalizer,it indicates the time of events when used with verbs or verbal phrases and a quality or a state when used with adjectives,which is semantically in complementary distribution with nɔ44 and ȵi21.The data of Meiba Bai further demonstrate the diversity and systematization of nominalization in Sino-Tibetan languages.