The prerequisite of normal operation of TRT by using blast-furnace gas is to ensure the high stability of top-pressure in blast-furnace. Under condition of normal power generation by TRT

the main factor leading to unstability of top-pressure in blast-furnace is the intermittent loading of materials into the blast-furnace

this factor has been introduced into the top-pressure model of the blast-furnace under normal power generation of the TRT. The said dynamic model has been established by using the method of adopting mechanism analysis and combining with parameter's recognition based on practical operation data. Combined with concrete examples

the control system of the top-pressure in blast-furnace

which can satisfy the condition of closed loop recognizability

has been analyzed. The result of simulated verification for the established model shows that the said model can reflect the practical operation situation of the top-pressure in blast-furnace under normal power generation of the TRT.