The structure of 「N1+の+N2」with nouns qualify nouns is one of the foundation of the conjoined modified structures. The structure is used very high frequency in the process of learning. By evaluating the learning situation of this structure, we can find that learners may miss 「の」 where is needed in the conjoined modified structure. Researchers of second language acquisition research often call「の」 shedding misuse. It has been a lot of research that the Chinese of Japanese learners falls of 「の」 phenomenon in 「N1+の+N2」structure. Previous studies have a variety of reasons of the misuse. This research divides into primary, intermediate and advanced phases using learners’ composition corpus, and examines the characteristics in the process of acquisition. And this research also verifies previous studies claims using the corpora data. Finally, we explore the reason of 「の」 falling off the 「N1+の+N2」 structure.