An audio system with sound-field-type nature sound effect includes: a first primary channel playing device for playing a primary audio signal generated according to a left channel audio signal and/or a right channel audio signal; a first secondary signal circuit for generating a first secondary audio signal according to the left channel audio signal and the right channel audio signal; and a first sound field control playing device connected to the first secondary signal circuit and adapted to play the first secondary audio signal; wherein a first playing delay period exists between the playing of the first secondary audio signal and the playing of the primary audio signal; wherein the first secondary audio signal played by the first sound field control playing device does not undergo audio mixing with the primary audio signal by a first audio mixing circuit.