Longfengshan gas field water well is characteristic of deep well depth，high gas temperature（104—149℃）and super high content of condensate oil for some blocks. A kind of organic ammonium salt type cationic fluorocarbon surfactant was synthesized，and it was mixed with the existing foaming agent as a ratio of 1∶15，which was composed of zwitterionic surfactant cocoamidopropylbetaine and sodium alpha-olefin sulfonate at ratio of 10∶1，thus the foam unloading agent PQ-Y was developed. Its foaming ability，foam stabilizing ability and liquid carrying ability were tested and field test was also carried. Laboratory tests showed that the initial foaming height Ho and foam height after 5 min H5 of the foam unloading agent were 194 mm and 186 mm，respectively，after aging at 160℃ for 14 h，and Ho and H5 were 189 mm and 180 mm when the salinity was as high as 250000 mg/L，and Ho and H5 were 171 mm and 168 mm，respectively，when the volume fracion of petroleum ether was 50%，its liquid carrying rate was as high as 8 mL/min，which indicated that the foam unloading agent PQ-Y was resistant to the condensate oil. The field test of the foam unloading agent in Longfengshan north 201-XY well showed that，the average gas production increased from 7256 m3/day to 11329 m3/day，increasing by 56%，the average differential pressure between tubing and casing dropped from 2.66 MPa to 2.38 MPa，felling by 10.5%，both liquid yield and gas production were obvious，which proved that the foam unloading agent PQ-Y could meet the demand of drainage gas recovery for high content condensate oil gas field