Abstract: Aiming at the characteristics of Daaniudi gas field such as low - porosity, low permeability and low producing energy, a new water base guar fracture fluid system, mixed with nitrogen gas during the whole treatment, has been developed. The performance evaluation indicates that: the fracturing fluid system has the features of low filtration, good rhelogical property, good compatibility, easy flowback, and low damage to the permeability of rock matrix. Through application and popularization, good effect has been received in Daniudi gas field.