It was probably established in the thirteenth century, when the word "Ezo" can be seen for the first time as mentioned above; however, the greatest difference between the Satsumon culture and the Ainu culture was the increase in imported items (especially ironware), meaning that it should be seen that Ainu had increased negotiations with Japan when the Ainu culture was born, because the Ainu culture was very reliant on trade with Japan.
その成立時期は上記「えぞ」の初見と近い13世紀と見られており、また擦文文化とアイヌ文化の生活体系の最も大きな違いは、日本からの移入品（特に鉄製品）の量的増大にあり、アイヌ文化は交易に大きく依存していたことから、アイヌ文化を生んだ契機に日本との交渉の増大があると考えられている。