1. Plug the holes where indoor rats are easy to get in and out, put 20-40g of rat bait in the hole, and place a rat trap at the portal connected with the outside (the rat trap should be made of metal, and the height should not be less than 60cm). 2. Generally, 2-3 rat traps, sticky boards or rat cages are placed in a room of 20 square meters. 3. Rat bait: Flufenuron, bromadiolone, diphacinone sodium, etc. The bait of rat medicine is rice, wax pills, granules, etc.