It suggests flexible construction for the kiln system is the premised cause, and kiln scale and kiln division of labor are decisive cause in this case.

• 本文试从单字款出现的可能性和必要性探索单字款出现的原因。认为当时宽松的烧窑制度是单字款出现的前提条件，而窑业规模和窑工分工是单字款出现的决定性因素。