A simulation method of the vehicular TTCAN communication network, especially it is applicable to development, simulation and test of the vehicular TTCAN network protocol and belongs to the industrial field bus technology area. The method adopts the 32-bit single-chip with the CAN controller, internal clock and independent interruption processing unit, after the program is written into the single-chip, the single-chip will transfer the TTCAN signals. The invention uses the advanced TTCAN protocol technology and realizes one new vehicular TTCAN communication network simulation program combining with the MPC5xx development platform, the simulation program has powerful computing capability and is separated from the bottom drive, the readability of the protocol is good and is easy to modify and maintain.