The present invention provides a CAN bus control method, comprising: configuring all nodes connected to a CAN bus to use a unified clock; and making all the nodes send packets on the CAN bus according to a unified plan after all the nodes are powered on and initialized. In addition, the present invention also provides a communication system using a CAN bus, comprising: a CAN bus; and a plurality of nodes connected to the CAN bus, wherein each of the plurality of nodes is configured to use a unified clock, and each of the plurality of nodes sends a packet on the CAN bus according to a unified plan after all of the plurality of nodes are powered on and initialized.
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