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Hi magic Gao,
How are you driving the transducer? Are you using a transformer or direct-drive configuration? How many pulses are a you transmitting? What is your drive/receive frequency set to?
OUTA/B should appear as a sinusoidal waveform (CH3=purple=IN2) when connected to a transformer (this example uses a center-tap voltage of 9V):
OUTA/B should appear as a square waveform (CH2=blue=XDCR+) when connected to a half-bridge direct-driver (this example uses a high side voltage reference of 7.2V):
It almost appears as if no load is connected to the OUTA/B pin you are probing. Can you ensure you have continuity?