Joint lottery buyers should try to agree in writing in detail how to share risks and benefits, form a legally binding agreement, and properly keep the lottery tickets jointly purchased. As stipulated in the Regulations on Lottery Management, it is necessary to show and register the identity documents for the grand prize, so when winning the grand prize in the joint lottery, one person should be entrusted to win the prize, and a written bonus distribution agreement can be signed, and notarization can be carried out if necessary. Second, in order to prevent loss and theft, the bettor can sign in the signature area on the back of the computer lottery ticket, so as to prove the right to use the lottery ticket in case of disputes in the future. Third, use telephone betting or mobile betting to buy lottery tickets. At present, with the development of communication technology, telephone, mobile phone and other channels to buy lottery tickets are becoming more and more perfect. Stay at home and buy lottery tickets by phone and mobile phone anytime and anywhere. More importantly, both of them have redemption reminder function, small prize automatic transfer and grand prize reminder, which can completely avoid the abandonment of prizes.