If it is about 1 week after flowering, young fruits will shrink, which is generally caused by improper pollination; If it is 2 weeks after the flowers wither, it is generally because the new shoots grow too vigorously and compete for too much nutrition, so that the young fruits shrink and fall off. Treatment methods: remove the diseased fruit in time, do a good job of shaping and pruning peach trees in summer to ensure that the branches in the inner room can receive more light; Top dressing and watering in time, and spraying corresponding drugs when necessary.