Abstract: A method for accessing data acquired by a digital oscilloscope, consists of the following steps: sampling signals based on a preset sampling frequency and converting into binary data by an ADC, continuously storing the data into a buffer based on preset rules; simultaneously, generating one trigger event based on preset timebase parameters and trigger conditions each time when acquired data meets the, trigger, conditions; reading a data segment from the buffer corresponding to the trigger event, and forming a waveform and then displaying. The procedure of storing, the acquired data into the buffer is independent of the procedure of generating the trigger event or reading the data segment or displaying the waveform.