1. College of Earth Sciences，Jilin University，Changchun 130061，China; 2. Exploration and Development Research Institute of Northeast Oil and Gas Company，SINOPEC，Changchun 130062，China

Based on the gas single flash experiment and gas reservoir water chemical examination， the types of water production of Songnan gas field in Songliao Basin were determined． Combined with fine description of volcan- ic reservoirs，the different water production mechanisms were analyzed． Furthermore，the authors explored the wa- ter control strategy based on numerical simulation． The water production in Songnan gas filed can be divided into two types: condensate water and formation water． The gas wells which drilled the high volcanic edifice produce condensate water， while drilled the low volcanic edifice produce formation water． The bottom water coning along the fault is the primary cause of formation water output from some gas wells drilled the high volcanic edifice． The nu- merical simulation indicated that there is a positive correlation between gas recovery rate and bottom water coning rate． The optimal gas recovery rate in Songnan volcanic gas field is about 3. 6%． According to the water control principle of high production at high structural position and low production at low structural position， the authors cal- culate the reasonable production of volcanic gas wells with different types and locations to meet the needs for a long- term stable production in volcanic gas reservoirs．