Abstract: Objective： To investigate and analyze reporting situation of network Meta-analysis.Methods： PubMed，EMBASE.com，Web of Science and Cochrane library were used to find related NMA， NMA were select based on the inclusion and exclusion criteria. Data were extracted by 2 reviewers independently by Excel software and analyses were performed using STATA12.0 software.Results： A total of 391 NMA were included. Among them， 383 NMA reported information related to retrieval information， whereas free text， Mesh terms and free text combine Mesh terms were used to find related studies in 313， 207，192 NMA respectively.301，298，18，228，258，201，195 NMA reported disease terms， intervention terms， outcome terms， design terms，disease terms combine intervention terms， disease terms combine design terms， intervention terms combine design terms，which used to find related studies.69 NMA reported the search strategy，12 NMA showed the search strategy in full text， at the same time，54 NMA used appendix or additional file to present the search strategy30，27 NMA reported the related limitation in time and language respectively. 116 NMA repoted the search results，138 NMA provided a flow screening chart.Conclusion：The results from our study showed that the current published NMA lack of the details of retrieval strategies and the search results， at the same time， the flow screening chart and retrieval stuffs should should be reinforced. We sincerely hope that analysts will take this as a warning and report related retrieve information of NMA in future.