Objective To provide the best evidence for creating dementia-friendly environments. Methods We searched the related websites and electronic databases from inception to August 31, 2018 to retrieve guideline, consensus, evidence summary, recommended practice guidelines and systematic review, then quality of the literature was evaluated. Results Six guidelines, 1 expert consensus and 11 systematic reviews were included. Seventeen pieces of evidence were summarized, of which 9 were grade A recommended and 8 were grade B recommended. Conclusion The 17 pieces of evidence regarding dementia-friendly environments cover safety, stability/familiarity, visual cues and sensory stimulation.The elder-care institution and family can choose the recommended evidence by combining with actual situations to provide a friendly environment for the elderly with dementia, thus to reduce adverse events.