Abstract: By observation of the flowering feature of Juglans mandshurica, the dichogamy of it was revealed. The results showed that:(a)The dichogamy of Juglans mandshurica was steady.(b)If the staminate flowering of protandrous meet with the pistillate flowering of protogynous, the pistillate flowering of protandrous could also meet with the staminate flowering of protogynous. But some staminate flowering of protandrous meet with the pistillate flowering of protandrous and staminate flowering of protogynous meet with the pistillate flowering of protogynous in different plant. (c)The dichogamy was not significantly related to the yield, the degree of uniformity of nut, the percentage of fertile fruit, morphology.

Key words: Juglans mandshurica, dichogamy, protogynous, protandrous