Abstract: The pressure drop and heat loss in steam injection pipeline has a harmonious relationship with reservoir absorption capability in steam injection process. A model of injection parameters node analysis is presented, which taking surface pipeline, wellbore and formation as a whole. Based on the comprehensive model of two-phase flow and heat transmission, it can make the node analysis on injection parameters in combination with the absorption capability of formation. The results tallies with that in SPE literature, thus the validity of this model is verified.