Wireless sensor technologies have been in development for a long time. Many wireless sensor technology studies have been conducted on improving device performance. Huge technology resources were recently found under the ocean. Previous research methods cannot mapping the underwater environment directly. Underwater wireless sensor networks are being developed for ocean resources deep water exploration. However, little agreement has been reached on an appropriate underwater dedicated distribution model. We focus on accurately depicting 3-D underwater sensor placement based on the coverage issue. Therefore, we design a novel distribution model using the spline function for more accurate underwater wireless sensor placement.