In the low-permeability oil layer of the oilfield,the formation is pressed open by pressure,a crack is formed and supported by a proppant to reduce the resisitance of fluid flow to achieve the purpose of increasing production and attention.After crosslinking,the fracturing fluid thickener can send a high content of porppant into the crack,playing the purpose of supporting the crack,and this product has good shear resistance and thermal stability.