Abstract: In order to balance production in log yard, we need tree-length storages. The key is where tree-length storages are, at log yard, langing or both. The problem is still in arguing. The article regards the forest logging system as a study object, and establishs calculating mobels about the cost consumption of tree-length storages in logging, transporting and log yard stages, and also deduces relacionships among them and distributing coefficient of tree-length storages (α) in landing. The article developes a function of total tree-length storage cost and α, However, after calculating practicaily if the total tree-length storages Q is<200 thousands m³, would be a minus value, This means that the total tree-length storages should be in log yard. In general, the total tree-length storages of an enterprise cann't exceed 200 thousands m³. Therefore,the distribution problem of tree-length storayes does not need to be considered at present.

Key words: Tree-length storage, Timber storage, Balanced production, Distributing coefficient of tree-lenrth storage