Abstract: We deny the opinion that the Klein-Gordon equation can be treated as the wave equation of boson. An equation to describe particles with spin 1 is introduced. This equation has the form of 8 × 8 matrix or quaternion of three rank and in which the first-order derivatives to both time and space parameters appear. Some important operators of this particle are established. The plane wave solution and spherical wave solution to free particles are also given.

Key words: boson, probability wave, non-probability wave, wave equation