From 6th to 8th March 2010, a party of six persons arranged by deputy manager of Plant No.1 visited EMU maintenance site based at Guangzhou and carried out follow-up process for issues of CRH3-380 Toilet project. There were 15items of problems, 5 items of optimization and improvement during this review, which provides important evidence for optimization of product quality and design, to ensure the signing of serial orders in later phase.