Carbon dioxide intelligent emission system in solar greenhouse, experimental study on gasification effect of nozzle was carried out. The main experimental conclusions were as follows:（1） the vertical placement effect of the pipe installed with spray nozzle was better;（2） the air flow on the central axis of the pipeline was stable and the nozzle outlet should be placed there;（3） the water level difference between the liquid bag and the spray head was proportional to the gasification time;（4） the environmental temperature was directly proportional to the gasification time of the liquid;（5） the switch position was negatively proportional to the liquid flow rate.