Abstract: The MET (Model Evaluation Tools) comprehensively uses many kinds of advanced model testing and evaluation algorithms, such as the classical methods, the analysis of high resolution mode diagnosis, ensemble prediction, probability forecast, and the typhoon path test. It is the newest numerical prediction test, evaluation system developed by DTC (The Developmental Tested Center) in the NCAR (National Center for Atmospheric Research, USA). The main purposes are not only to provide a mode performance test tool for mode developers, but also to give users a forecast ability of distinguishing mode and then getting the forecast index by using MET. MET provides abundant interfaces of stations and grid data; it's core component integrates many advanced classic mode test methods above mentioned. In addition, it provides various drawing scripts based on language R for user's convenience. This article briefy explains the MET system, and gives a precipitation test example based on the MET object-oriented method and neighborhood method.