Nowadays，parameter at both ends of the core may be gotten through conventional profile control experiments.However，the flow process of fluid such as oil，water or profile control system could not be visually presented in those experiments. In this paper，CT technology was applied to observe the dynamical flooding processes in core model casted by epoxy resin without damage，and then the front location of the water flooding and migration characteristics of modified starch gel in different times were re-established. Experimental results show that the CT technology can be effectively used in migration characteristics research and presentation for the profile control system. When it is applied to a positive rhythm core model with a permeability contrast of 30，the starting location of the low permeability layer in the first water drive could be given and seen. In the meantime，the profile control system can flow forward with the whole slug state in the high permeability layer，which can effectively shut off the flow channel in the high permeability layer after the gel is formed. Positioning profile control and water plugging may be realized and swept volume of the subsequent water may be expanded obviously. Oil recovery efficiency by water flooding is increased by 15.08%. This paper provides a new experimental method and research idea about the deep water plugging and profile control in heterogeneous reservoirs.