In the controller in-band connection mode, a control message intensive based flow update strategy is proposed to reduce the flow table update time and simplify the process of pushing flows. The flow table update is discussed from two aspects, i.e. path creation and path switching. The source routing and tracking packet are used to intensify the form of flow table update message and plan the way to send it. This strategy is aimed at guaranteeing the consistency of the flow table update and simultaneously reducing the amount of information of controllers receiving and sending and updating time. The simulation results show that rather than classification based flow update strategy and path and feedback based policy update strategy, by this strategy the flow table update time is reduced severely and no great fluctuation is caused in data transmission under different link delay and transmission rate conditions. In addition, the amount of information that controllers receive and send by this strategy is similar to PF-FUS, and both the amounts of information are lower than that of C-FUS.