Accessories include: arch pipe bracket, arch pipe connector, arch pipe sheath, arch pipe bolt, arch pipe support frame, arch pipe washer, etc. The arch tube bracket can fix the arch tube, the arch tube connector can connect the arch tube, the arch tube sheath can prevent the arch tube from being damaged, the arch tube bolt can fix the arch tube, the arch tube bracket can support the arch tube, and the arch tube washer can reduce the friction of the arch tube and ensure the installation quality of the connected greenhouse.