Using pretilachlor before seedling, the number of weeds will be much less after seedling, and it will be easier to beat some weeds. Closed herbicide should be applied within one to three days after rice sowing. Post-emergence barnyard grass can be used, such as Doggering, Dichloroquine Phosphoric Acid, Cyhalofop-methyl, pyrimidixim-methyl, etc. Broad-leaved grass can be used with products such as pyrazosulfuron, dimethyl carbon tetrachloride and bentazone. Apply pesticides about half a month after direct seeding of rice.