Static adsorption characteristics of dendronized polymers for EOR at different branching degree on quartz sand were studied via soaking method, and the molecular size, microstructure of polymer solution were investigated though Dynamic and static laser light scattering instrument and Environmental Scanning Electron Microscope respectively. It was found that, all of isothermal adsorption curves of dendronized polymer solutions were presented to three stages; At initial stage, polymers owed small branching degree had smaller steric hindrance than polymers of large branching degree on quartz sand possessed constant surface area due to its fewer number of branched chains and smaller hydrodynamic radius, resulting that its adsorbing capacity greater. In the phase of multilayer adsorption, dendronized polymers had strong branching degree could easily wind and form a network structure because of the intense interaction of branched chain, leading that its adsorption layer and adsorption quantity on the quartz sand surface were more than polymers of weak branched degree.