Vegetable soybeans were seeded in whole year in Guangzhou which is in tropical and subtropical zones , theresults showed that the soybean plants grew normally in such environment as the effective accumulated temperature is ≥1600 ℃ and the effective illuminated time is above 280hrs .It was properly that the soybeans was seeded from the dates ofthe lot 10th -20th of March to September .If the soybean was seeded in spring , about seventy days were needed fromseeding to harvest the pods which is in R6 -R7 , and only sixty days were needed if the soybean was seeded in summer ,but seventy -five days were needed if the soybean was seeded in autumn .The yield , the quality and the benefit of thesoybeans seeded in autumn were the best among those of the soybeans seeded in the three seasons .