The design of “Naturalistic” waterscapes is intended to not only have natural interest, but also become self-sustaining by simulating the form of natural waterscapes, by starting from interpreting generation rule of their natural counterparts. This paper applies the parametric method to the design of “Naturalistic” waterscapes, compiles an algorithm by applying Grasshopper and Rhino software and based on the design logic construction, creates a parametric design model for “Naturalistic” waterscapes. Following this, the paper discusses the parametric design process of Naturalistic waterscapes in combination with the design practice of the Meirenchong Scenic Area in China’s Nanjing Flower Park.