Abstract: Repeated fracturing is an important means to maintain the productivity of old wells, however, with the increase of repeated fracturing, the effect of oil increase and the effective period of oil production will de-crease greatly. The temporary plugging turning to repeated fracturing can realize new fractures in the old fractures and communicate with larger oil drainage area, thus improving oil well production. According to the physical model experiment of fracture steering mechanism, the mechanism of fracture building and extension is understood. The experimental results show that the repeated fracturing fractures are mainly extended along the old fractures, and the limit of the stress difference of the forced turning of the old fractures is 8 MPa. Field test results show that the selected high strength and low damage fracture steering agent has successfully achieved multistage fracture steering, and the application effect is good.