Abstract: This article,according to the technological process of production of colour cement based on colour mixture technique and direct scorifying technique, advances the basic-theory of cement colouring, which deals with mixture, disrecsion, spread, coordination field, solid solution and lattice defect, etc. On the basis of the aforesaid theory and actual conditions of cement colouring, the authors have made first exploration, and pointed out two different viewpoints of explanation of cement colouring mechanism. They have also made a brief introduction to their views.