Lottery Rules: Seven kinds of lottery tickets are uniformly organized and issued by China Welfare Lottery Center and jointly sold by provincial centers within their respective administrative areas. Qilecai is sold by computer network system, and the provincial centers participating in joint sales merge prize pools, unified prize counting and unified lottery. Qilecai adopts the combination method, and seven numbers are selected from 30 numbers (0 1-30) to form a betting number. The amount of each note is RMB 2 yuan. Seven-color lottery is sold three times a week, and the number of issues is determined by the date of the lottery, arranged according to the calendar year. Seven lottery betting methods are divided into self-selected number betting and machine-selected number betting, and the betting methods are divided into single betting, double betting, bold drag betting and double betting. The bonus of Qilecai is 50% of the total sales, of which the current bonus is 49% of the total sales, and the adjustment fund is 1% of the total sales. There are seven prizes in the Seven Lottery Current Prize, with the first to third prizes being high prizes and the fourth to seventh prizes being low prizes. The high prize adopts floating prize, and the low prize adopts fixed prize. The current bonus minus the current low prize is the current high prize.