Beheaded isolated rock refers to the isolated rock of dramatic ups and downs on longitudinal of the riverbed and in shape of fracture，which causes deep sag in the upstream riverbed.The conventional regulation method is hard to obtain better effects due to the special beheaded boundary which makes its flow condition more complex.Based on the Zhuanzaozi shoal in the fluctuant backwater of Three Gorges reservoir in Chongqing city，we probe into the regulation method of beheaded isolated rock using the river model test，and propose to combine rock blasting with the submerged fish-mouth connecting dikes to regulate the beheaded isolated rock shoal.