The dependence of temperature on diamond growth region in ternary C-H-O phase diagram for diamond growth is calculated on the basis of the non-equilibrium thermodynamiccoupling model. With the rising of temperature, on the whole the diamond growth region inisotherm phase diagram seems to rotate anti-clockwise around its core. In the meantime, itsshape gradually changes from an arch to a triangle via a transition shape like trapezium. Apossible diamond growth region in a projective ternary C-H-O phase diagram is also conducted, and is in agreement with the experimental data reported by Marinelli et al.
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