Embodiments of the present disclosure provide a touch sensing method, a touch chip, an electronic device and a touch system. The touch sensing method includes: acquiring a recorded strength threshold of a touch detection signal, and determining a strength of a touch detection signal transmitted between a stylus and a touch screen at a current time; and determining whether the strength of the touch detection signal at the current time is greater than or equal to the acquired strength threshold, and concluding that the stylus is in contact with the touch screen at the current time if the strength of the touch detection signal at the current time is greater than or equal to the strength threshold.