In order to simplify the task of developing parallel programs based on data-parallel paradigm, this article presents a data-parallel programming tool: DaParT. With its usage, sequential solutions of the nonexpert parallel programmers can be run in data-parallel. The tool was implemented on Helios, MPL, PVM and MPI. The tool is portable to the parallel environments with the support for the basic message passing primitives. The usage of the tool is clarified by an example: simulation of the Hopfield net. Lastly, the benchmark results collected are discussed.