The associated gas recovery and comprehensive utilization have very important meaning with continuous increase of natural gas and development of national economy. Such products as ethane, propane, butane and stable light oil separated from associated gas have very considerable economic benefits when used as raw material of ethylene especially. Analyzed are components of associated gas from Changqing Oil Field Jiyi multi-purpose station and applied is HYSYS software for simulation calculation of associated gas low temperature oil absorption process. Results show that propane yield coefficient can reach up to more than 80% if stable light hydrocarbon from the unit is used as absorbent to conduct secondary absorption of gas from deethanization tower top. The method is applied in Changqing Oil Field Jiyi multi-purpose station, its light hydrocarbon recovery unit operates smoothly. The method is worthy of being popularized in domestic other oilfield associated gas recovery.