Abstract: The effects of microwave (2450MHz) energy tre at ment with different duration on the cucumber seeds and/or seedlings are studied. The results are as follows: The microwave treatment does not affect the germina tion of seed, the seedling age, and node order when the first male and female fl ower bud emerged. But, the microwave treatment increases obviously the number of either male or female flower per plant related to the duration of treatment. It is the first report concerned to that the microwave treatment may improve the f lower formation.