The article aims to figure out the features of simple sentences in Chinese Russian-learners' interlanguage, which is regarded as a constantly developing, consistent internal language system in the process of acquiring second language. The definitions of the term “interlanguage” in Russian and forein linguisitics are deeply concerned. At the same time, relations among bilingualism, interference and interlanguage are discussed with the help of several figures. Theoretical syntactic studies in Russian linguistics are demonstrated in order to provide a theoretical framework for the article. The main feature of simple sentences in Chinese Russian-learners' interlanguage - singularity is investigated by analyzing language materials, which are collected by the author. Singularity of simple sentences is discribed from such aspects as sentence members, sentence structures and word order.