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A facsimile transmission method on the CDMA cellular networks is disclosed and includes the following steps. A data terminal having upper layer protocols of a PPP and above recognizes and stores a modem command until a facsimile modem in a base station is acquired, and requests the fax call caused by a modem dial command with dial number to the mobile terminal through a serial interface. The mobile terminal establishes a fax call with a base station based on the same call processing as that of a voice, and acquires the facsimile modem in a base station. After the call establishment between the mobile terminal and the base station, the upper layer protocols in the data terminal are initialized and negotiated with counterpart protocols in the said base station. The data terminal transmits the fax image data encapsulated by the upper layer protocols to the mobile terminal and the mobile terminal transmits it encapsulated and segmented by the lower layer protocols to the base station. The base station recognizes the encapsulated and segmented image data, processed it to remove the protocols and converts the raw data to transmit to the counterpart fax terminal in an identical CDMA network or a different network such as PSTN. Thereafter, the facsimile application software in the data terminal and the counterpart fax terminal progress the facsimile service following the standard phases of the ITU-T recommendation T.30.