A testing system includes a testing apparatus and a crack noise monitoring device. The testing apparatus includes a testing stage and an element pickup module for pressing a semiconductor element on the testing stage. The crack noise monitoring device includes a database unit, a sound conduction set, a voiceprint generation unit and a processing unit. The database unit has a first voiceprint pattern. The sound conduction set is connected to the voiceprint generation unit and the testing apparatus for transmitting a sound wave from the semiconductor element to the voiceprint generation unit. The voiceprint generation unit receives and converts the sound wave into a second voiceprint pattern. The processing unit is electrically connected to the voiceprint generating unit and the database unit for determining whether the first voiceprint pattern is identical to the second voiceprint pattern.