Continuous variable entangled state of light with quantum correlation in quadrature amplitude and quadrature phase is the key resource to realize quantum information and quantum computation processing. With the rapid development of quantum information and quantum computation, correlation degrees of entangled state of lights have to be enhanced to match the requirement of high-quality information transfer and high-efficiency quantum computation. Continuous variable entanglement enhancement is an efficient method for the generation of entangled state of light with high entangled degree. The relation between the continuous variable entanglement enhancement and the experimental parameters of non-degenerate optical parametric amplifier is calculated. The influence of these experimental parameters on the entanglement enhancement is also discussed. This provides the direct references for optimizing the continuous variable entanglement enhancement system consisting of non-degenerate optical parametric amplifier.