A method of controlling a droplet producing system comprising: supplying a first carrier fluid to a first transport channel; supplying one material comprising at least a first material and a second material to a first droplet producing chip to discharge a first discharge fluid to the first transport channel through a first outlet channel included in the first droplet producing chip, wherein the first discharge fluid comprises a material fluid comprising the first material and a droplet comprising the second material, the droplet is produced from the material in the first droplet producing chip; generating a first combined fluid by combining the carrier fluid in the first transport channel with the first discharge fluid, wherein the supplying of the first carrier fluid to the first transport channel is for allowing a flow rate of the first combined fluid larger than that of the first discharge fluid; characterized in that the method further comprises: controlling whether the droplet comes into contact with air before the discharge fluid and the carrier fluid are combined, wherein the controlling whether the droplet comes into contact with air is achieved through a carrier fluid controller by controlling one or more selected from an inflow time point, an inflow stop time point, an inflow time, an inflow stop time, an inflow amount and a flow rate of the carrier fluid, a flow velocity thereof in the transport channel, and an inflow location. supplying a first carrier fluid to a first transport channel; supplying one material comprising at least a first material and a second material to a first droplet producing chip to discharge a first discharge fluid to the first transport channel through a first outlet channel included in the first droplet producing chip, wherein the first discharge fluid comprises a material fluid comprising the first material and a droplet comprising the second material, the droplet is produced from the material in the first droplet producing chip; generating a first combined fluid by combining the carrier fluid in the first transport channel with the first discharge fluid, wherein the supplying of the first carrier fluid to the first transport channel is for allowing a flow rate of the first combined fluid larger than that of the first discharge fluid; characterized in that the method further comprises: controlling whether the droplet comes into contact with air before the discharge fluid and the carrier fluid are combined, wherein the controlling whether the droplet comes into contact with air is achieved through a carrier fluid controller by controlling one or more selected from an inflow time point, an inflow stop time point, an inflow time, an inflow stop time, an inflow amount and a flow rate of the carrier fluid, a flow velocity thereof in the transport channel, and an inflow location. controlling whether the droplet comes into contact with air before the discharge fluid and the carrier fluid are combined, wherein the controlling whether the droplet comes into contact with air is achieved through a carrier fluid controller by controlling one or more selected from an inflow time point, an inflow stop time point, an inflow time, an inflow stop time, an inflow amount and a flow rate of the carrier fluid, a flow velocity thereof in the transport channel, and an inflow location.