Abstract: Fibrous substances mainly include derivative of cellulose and fiber material，which are used in fracturing fluid.The former，mostly used as thickener，is used in gelled water fluid or water-based gel fracturing fluid，while the later，used as reinforcing material for the proppant，becomes research focus，on which in-depth study has been carried out and the result applied in the oil and gas fields abroad，a small number of pilot tests were made at home as well.Research and application at home and abroad show that fracturing fluid，to which the fiber material was added，suspended and carried proppant in physical method，and it has a better sand-carrying performance at low viscosity.When the fluid flows back，fibers form spatial network structure scattered in the proppant，which has a better property of sand prevention.After construction，the fluid can flow back in a great quantity without shutting，and the efficiency of fluid flowing back significantly higher than that of conventional fracturing fluid.What′s more，fibers help to optimize size of cracks to form a more effective artificial diversion channel，and it has a remarkable effect in increasing production.The fiberous materials can be applied to sand production and low-permeability oil and gas reservoirs.

Key words: fracturing, fiber, additive, carrying proppant, sand prevention