Zhoukou belongs to the northern region. Watermelon can only be planted as a late-maturing variety, and it takes 100- 120 days to mature, that is, nearly four months. Now in June and 10, the temperature and light in Zhoukou can't meet the growth of watermelon, which will lead to reduced production or no harvest. Watermelon breeding in Zhoukou area is usually in March and April, and now it has begun to drag seedlings.