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With the rapid development of electronic and military industry, there is an increasing test need of different kinds of complex signal. In order to meet the need of multi-signal, multi-frequency segment and multi-variable test, a high effective portable multifunctional tester is designed, which integrates many kinds of instrument functions including multimeter, audio analyzer, arbitrary waveform generator, oscillograph, RF signal generator, spectrum analyzer and so on. The hardware frame of the tester is based on PXI bus, and each function module is unattached. The software frame of the tester is layered which is clear and has strong expansibility. The volume of the multifunctional tester is small, but its functions are multiple, it can meet the need of testing different kinds of signal at the same time, and improve test efficiency obviously.