The process of acquiring morphemes is one of the most interesting issues in psycholinguistics. Language acquisition is related to the first language and explains a certain order of acquisition of sounds, words, grammatical signs, sentence structure. This procedure serves as a basis for learning the language as a foreign language. The article shows how the hypothesis of natural order works in the Uzbek language, that is, an experiment was conducted on the acquisition of a certain morpheme earlier than other morphemes in the systematic acquisition of grammatical forms in the Uzbek language. It shows that an experiment was conducted with 14 Chinese language learners studying Uzbek as a foreign language. Experiments were conducted in China, in an environment where Uzbek is not the native language, and the results were generalized. The participants of the experiment were asked to put the necessary morpheme in the blank spaces and to translate the given sentences from Chinese to Uzbek, and to evaluate the experiment carried out by them. From the obtained result, the order of accuracy level of grammatical additions in Uzbek was determined and compared with the order of morphemes obtained in the acquisition of Uzbek as a first language.