Fracturing is an effective method to improve the single well production in Daniudi gas field due to its low-porosity and tight properties. In order to meet the demand of green gas field construction in Daniudi, it is necessary to reduce the reservoir damage and cost-effective fracturing fluid system. In this paper, an ultra-low concentration guar gum fracturing fluid system suitable for low-porosity and tight gas reservoirs was developed, which was characterized by the introduction of independently developed super-delayed crosslinking agent, which reduced the amount of hydroxypropyl guar gum to 0. 25 % ~ 0. 30% , compared with the conventional 0. 45% hydroxypropyl guar gum dosage decreased by 30% ~ 44% . The cross-linking time of the ultra-low concentration guar gum fracturing fluid system was 35~ 45 s, meanwhile the viscosity of crosslinked jelly was more than 100 mPa· s under 90℃ , 170 s - 1 after shearing 120 min and it still had fine prop-carrying ability under 38% high sand concentration. Applying APS and FANTA enzyme coupled breaker technology, the gel-breaking time was 120 to 240 min,and the viscosity of gel breaking liquid and residue value was less than 3 mPa· s and 200 mg /L, respectively. The characters of the fructuring fliud made flowback easily and decreased the formation damage. Ultra-low concentration guar gum fracturing fluid system could both reduce costs and meet the technial requirments for the field operation, which has great prospects for development.