The rapid pressure drop and salt deposit in wellbore after fracturing in the special reservoir containing a large amount of soluble alkali salt in the Mahu Fengcheng Formation，seriously affected the oil testing. In order to verify whether the fracturing fluid entering the well would have an impact on the dissolution of the reservoir salt mineral，the impact of different inflow fluids on the dissolution of the reservoir salt mineral was simulated，the cross-linked fracturing fluid system with on-line preparation，temperature resistance（120 ℃）and salt resistance（30×10^{4/sup> mg/L）was constructed and field tests was carried out based on the composition characteristics of the typical alkali salt mineral in the Fengcheng Formation reservoir. The results showed that the rate of dissolution high salt water to typical simulated salt was more than 60% compared with that of tap water. The“molecule interchain entanglement + association + salt effect”of suspension based hydrophobically associating polymer solution could be realized， resulting in the rapid dissolution and high viscosity increase of the base solution，and the cross-linked fracturing fluid system with on-line preparation， temperature resistance and salt resistance was formed between the thicken agent and the organic boron-zirconium-aluminum slow crosslinking agent by chemical crosslinking. The optimal formula was as follows，1.8% thickener GAF-TE+0.4% crosslinker JL-3+0.3% synergist GF15B+0.04% gel breaker APS. The shear viscosity of the system was greater than 100 mPa·s after sheared for 1 hour at the temperature of 120 ℃ and at the shear rate of 170 s-1，exhibiting good dynamic and static sand carrying capacity. The well M（three layers）fracturing were successfully constructed on site. the oil test after fracturing was successfully completed，and the maximum daily oil production was 4.4 m3. The high-salt fracturing fluid system had certain positive effect on the reduction of formation pressure drop due to reservoir dissolution.}