Chord language is the natural (physical, mathematical) coding language of time-space and life. In chord language, music, painting, life, physics and other disciplines are interdependent and cannot be cut. They can be expressed in chord mathematics, which is like the theory of all things. Chord language is often expressed in the disciplines of music, painting, and meridian (the theory of oriental ancient medicine), which produce semantic expressions such as time, space, life, and spirit. The basic features are: quantized discrete spectrum, chord geometric semantics (open string, closed string, membrane string), which is a time-space, life coding language with physical and mathematical forms. Here is a question that cannot be avoided: quantum, string theory in music, painting? Music and painting are the most common chord language phenomena. In chord mathematics, the two are reverse-mirror relations, respectively expressing: time and space. Can directly present the nature and relationship of time-space. Chord language is not only a spiritual phenomenon (music, painting), but also a physical phenomenon (discrete spectrum, string), observing chord language events, such as: music, painting, etc. - also observing physical events, it has spiritual-natural isomorphism, This is its philosophical significance. The chord language is an ancient knowledge system, and its mathematical model can be traced back to the Pythagorean law of ancient Greece, gradually perfected by musicians of all ages. The chord geometry can be observed in chord painting: open string, closed string, Membrane string, which is predicted by string theory. Meridian (Oriental Ancient Medicine) observes the positive-negative (yin-yang) coding rules of chord language: they form the basis for observation and verification of chord language.