The replication of impressions on pottery is an effective method for reconstructing subsistence from sites without plant residue. Even if excavation has already finished, it is possible to identify cereals by replication. In addition, the replication of impressions left on pottery can be used from Neolithic to historical times, so far as pottery exists. In the case of severely weathered pottery it is difficult to replicate a large number of impressions. However, by attentive observation, it is at least possible to obtain some impressions from the pottery. The most meaningful result from our research was the identification of rice and millet from the Hanam Misari site, which has not yet yielded cereal remains. Pottery from Hanam Misari has been dated to the earlier part of the Initial Bronze Age. This period was examined as it is related with agricultural developments of the Late Jomon period in the Japanese archipelago. In addition, the season in which pottery production took place was calculated using impressions of plant remains other than cereals. These results illustrate that replications can be widely used and not be limited to the reconstruction of subsistence. It may therefore be suggested that the replication of impressions left on pottery, as with the analysis of plant remains, is a useful way to shed light on the nature of human lives in the past. It should therefore be established as an important method of archaeological analysis.