(1) Check whether the packaging of seeds is standard. All qualified seed packages are attached with standard labels, which clearly indicate the seed category, variety name, registered trademark, origin, quality index, quarantine certificate number, production license number, approval number, production batch number, production date and matters needing attention. (2) Check the appearance of seeds. See if the uncoated seeds are bright in color, full in particles and uniform in size. (3) Buy seeds from regular channels. Choose a manufacturer or distributor with high reliability when purchasing seeds; After purchasing seeds, ask the seller for a seed purchase bill.