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Point targets have no information on feature or size, etc. Itpsilas very difficult to detect it from one frame of image. It must be recognized from consequent multi-frame. The traditional methods to detect point target only use track of target moving between frames, but donpsilat concern the way of target moving. So itpsilas hard to recognize the property of the target. This text rises a way by establishing a standard curve library, and uses tri-interpolation approximation to match the curve of real moving curve with the library to recognize the target. The algorithm improves the speed of running. Through the simulation and real experiment, this method performs well and proves it available.