The basic configurations, software and hardware design methods and main functions of water pump testing system based on LabVIEW were introduced. This system can be used to carry out performance testing, automatic data acquisition, display, analysis and storage of various state signals of water pump. Modular design method was used in the development of the testing system, each functional module was independent to each other. It used serial port to communicate with the computer. The testing system of water pump has the following advantages: low cost, short development cycle, convenient expansion of functional modules.