Sclerotinia sclerotiorum is one of the most important diseases in rapeseed production. It may occur from the seedling stage to maturity, and the damage to the stem is the heaviest. Control methods: First, increase phosphorus, potassium fertilizer, a small amount of nitrogen fertilizer, at the same time to open up to facilitate drainage, good seedlings, maintain a reasonable density, spray paclobutrazol to improve lodging resistance, a reasonable density can reduce the humidity in the field can reduce the bacteria Sprawl; the second is full flowering mu with 70% thiophanate-methyl WP 100 grams or 20% carbendazim WP 200 g spraying has a better control of the disease.