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An automatic actuated fire sprinkler (AAFS) can sense temperature changes and actuate by itself automatically to control the discharge of water. Currently fusible bulb fire sprinklers are more compact and reliable in structure but they required maintenance to stop the discharge, once it opens. In this paper the design of AAFS is optimized to make it compact and simple in mechanism. Pilot pressure operated mechanism in AAFS was replaced by simple SMA spring actuated piston. By optimizing the design parameters of opposed spring and SMA spring, volume and number of parts of the AAFS can be reduced effectively. [ABSTRACT FROM AUTHOR]