You need to investigate the source of the noise downstairs, whether it is the sound of music or talking, or downstairs in the renovation of furniture and so on, the cause is very important, so that you can treat the symptoms.
If you have a good relationship with your downstairs neighbors, it's a good idea to have a friendly conversation and find a suitable time to ask your downstairs neighbors to come to your house for a meal, and talk about the problem at the dinner table.
If the downstairs relationship is not very good, and usually get along not good words, not afraid of me have a little trick. When he makes noise, he himself also makes noise upstairs, try to see whose influence is greater, if the other party has a reaction, by and large he will know that the antipathy, and will definitely come to the door, and then the problem will be solved.
If the downstairs in the renovation or some other life really will inevitably noise, the best way is to start from their own, tolerate. Most of this noise won't last long, and you can choose to close the door or listen to CD music on a regular basis to minimize the impact of the noise.
If the noise from downstairs is man-made or intentional. Just don't be polite. Fight fire with fire, or make it worse. You can tell neighborhood security whenever his house is making noise.
If it doesn't work again, only the police will be called.