The C-field cosmological model based on the Hoyle-Narlikar theory with variable gravitational constant G is investigated. To obtain the deterministic value of (C) =(dC/dt) we present certain constant values for integration at constants. The creation Geld is proportional to time. G and p (density) decrease with time and the universe represents an expanding universe. The creation field increases as time increases. We find C =(1/2πf)t where f＞0.Thus (C)=1 when f=1/2π＞0.