A system of dynamically adjusting a generation frequency of messages in vehicular networks, the system arranged in a carrier, comprising: a message receiving module comprising means for receiving application requests for a minimum update frequency of messages and for a message priority in the carrier and an event indication generated by the carrier according to events that occur anytime during the movement of the carrier, characterized in that: a need determination module connected to the message receiving module comprising means for determining whether a generation frequency of messages of the carrier meets the minimum update frequency and generates a frequency adjustment instruction when the generation frequency does not meet the minimum update frequency; an emergency determination module connected to the need determination module comprising means for determining whether the event indication is an emergent event after receiving the frequency adjustment instruction, and for generating an interruptive adjustment instruction when the event indication is determined to be the emergent event, or a progressive adjustment instruction when the event indication is determined to be not the emergent event; and an adjustment module connected to the emergency determination module comprising means for adjusting the generation frequency based on the interruptive adjustment instruction or the progressive adjustment instruction, wherein the adjustment module comprising means for, based on the progressive adjustment instruction, reducing a generation frequency of messages of another carrier, for detecting a channel load of a message transmitting channel in the carrier, and for adjusting the generation frequency of messages in the carrier based on the channel load; and wherein the adjustment module comprising means for, based on the interruptive adjustment, adjusting the generation frequency of messages of the application to be no lower than the minimum update frequency, and for reducing a generation frequency of messages of another carrier by transmitting one or more channel access parameters which are set based on a message priority degree. a message receiving module comprising means for receiving application requests for a minimum update frequency of messages and for a message priority in the carrier and an event indication generated by the carrier according to events that occur anytime during the movement of the carrier, a need determination module connected to the message receiving module comprising means for determining whether a generation frequency of messages of the carrier meets the minimum update frequency and generates a frequency adjustment instruction when the generation frequency does not meet the minimum update frequency; an emergency determination module connected to the need determination module comprising means for determining whether the event indication is an emergent event after receiving the frequency adjustment instruction, and for generating an interruptive adjustment instruction when the event indication is determined to be the emergent event, or a progressive adjustment instruction when the event indication is determined to be not the emergent event; and an adjustment module connected to the emergency determination module comprising means for adjusting the generation frequency based on the interruptive adjustment instruction or the progressive adjustment instruction, wherein the adjustment module comprising means for, based on the progressive adjustment instruction, reducing a generation frequency of messages of another carrier, for detecting a channel load of a message transmitting channel in the carrier, and for adjusting the generation frequency of messages in the carrier based on the channel load; and wherein the adjustment module comprising means for, based on the interruptive adjustment, adjusting the generation frequency of messages of the application to be no lower than the minimum update frequency, and for reducing a generation frequency of messages of another carrier by transmitting one or more channel access parameters which are set based on a message priority degree.