Protecting the interests of the goodwill opposite party and third party is the reason to research the appearing legal behavior and the need to be protected the normal transaction order and promote the honesty and credit 保护善意相对人和善意第三人的利益是研究表见民事法律行为的意义所在，是维护正常交易秩序，弘扬诚实信用的需要。
