The sound can be musical or non-musical. Music sounds can be specially created or taken from existing music scores; Non-musical sounds can be created or copied directly from nature. To sum up, sound trademark, as a kind of trademark, is also suitable for copyright protection mode. Then, the logo sound of the sound trademark-what conditions need to be met to obtain copyright protection? According to different kinds of sounds, two situations can be distinguished. First, the original logo of a sound trademark composed of musical sounds can be protected by copyright law. Music refers to a melody with certain rhythm and harmony. Obviously, as long as this melody meets the requirements of originality, the musical sound it forms naturally constitutes a work. Although it seems that the various elements that make up music may be infinitely arranged and combined, and it seems that the world of music creation is infinitely vast, in fact, the creative freedom of music works, especially excellent works, is not so satisfactory. This is because people's sense of music and preferences for specific melodies and rhythms are specific. Looking at the popular classical pop music, it is not difficult to find that the audience likes music with specific harmony. This has led to two phenomena: first, there is a conscious convergence in music creation. For example, in western creation, there are usually two octaves that last for three minutes, and seven pitches in a row are also common in pop music; Second, there is unconscious convergence in music. This situation refers to that the creator takes the original melody and rhythm of others as his own inspiration and adds them to his works out of subconscious memory. Because of this, it is quite difficult to judge the originality and infringement of music works. The author thinks that considering the particularity of music works, judging their originality should not be too simple. On the one hand, we should have basic melody expression, on the other hand, we should consider their similarities with existing music works, especially classic pop music works, especially the climax and soul part of existing music works. If you copy a paragraph familiar to the public, even if it is only a few paragraphs, it is enough to overthrow its originality. Second, non-musical sound trademarks are generally not protected by copyright. Non-sound trademarks refer to sounds with irregular rhythm or melody, including natural sounds and synthetic sounds, such as the lion's roar at the beginning of mikoyan's film, online voice of QQ, etc. Compared with music trademarks, the duration of non-music trademarks is generally shorter. Because there are too few notes, it is difficult to express a complete idea independently or reach the necessary creative height like the title of the work. For this reason, non-musical sound trademarks can only be protected by copyright law as independent works or sound recordings if they are combined with audio-visual or other media. Therefore, except for a few non-sound materials (generally used for dubbing film and television works, including many original contents such as design, recording, replacement, dubbing and mixing), most non-music sounds are difficult to enter the copyright field and are protected by copyright law.