According to the law of our country, it is necessary to sign a fund contract to purchase funds. The fund contract is an important legal document for both parties to agree and confirm their rights, responsibilities and obligations, and it has legal effect. If the bank does not sign an electronic contract or other forms of contract when purchasing funds, the purchase behavior will be regarded as invalid. This is to protect the rights and interests of investors and regulate the normal operation of financial markets. Therefore, when selling funds, banks should abide by relevant laws and regulations to ensure that legal and effective fund contracts are signed with customers. If it is found that banks do not provide electronic contracts or other legal contracts when selling funds, they can complain to the relevant regulatory authorities to safeguard their rights and interests.