The invention relates to phase change memory unit testing system and method. Its feature is that the testing system includes control computer, pulse signal generator, digital signal source, micro control probe table, and switch connecting part. The interface bus is used to connect main control computer with pulse signal generator and digital signal source. The middle three are connected by control cable of the control card. The main control computer is switched between pulse signal generator and digital signal source by micro control probe table whose two probes are respectively connected with up and down electrodes of the phase change memory to form a memory unit. Further more it can use operational module to realize seven kinds of detecting, such as current-voltage, voltage-current, resistance and writing pulse height, resistance and writing pulse width, resistance and swabbing pulse height, resistance and swabbing pulse width.