The decrease of gellant concentration would make the proppant carrying capacity of fracturing fluid become poor.Adding fiber in base fluid could reduce the concentration of gellant under the premise of ensuring the proppant pack stability.The effects of fiber to proppant pack stability were evaluated.Experiment results showed that the settling velocity of proppant decreased with increasing quantity and length of fiber.Fiber XW-3 with content of 0.2% and length of 8 mm could improve the proppant carrying capacity of fracturing fluid.And the addition of fiber was no influence on the temperature and shearing resistance to fracturing fluid.Rheological experiments showed that viscosity value increment reduced from 335.9 to 107.4 mPa · s when the dosage of fiber increased from 0 to 2.0%.Shear rate had smaller effect on the viscosity of fracturing fluid after adding fiber.Fracturing fluid containing fibers followed Kynch proppant sedimentation theory.The application of fracturing fluid in X well of Changqing oilfield on site indicated that fiber could improve the feasibility of fracturing fluid’s carrying capacity.