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Based on FPGA embedded programmable technology,adopted an existing CAN Controller Soft Core, and designed a CAN Bus transmission software which consists of the Soft Core and its control software. The transmission software which is embedded in a FPGA chip, together with the FPGA, form a CAN bus transmission system, which can transmit digital signals to the CAN bus. Through simulation, static timing analysis and hardware system testing, the results indicate that the system design and scheme of this paper is reasonable, feasible, and the timing is correct and its functions and performance can meet the design requirements. Design of this paper implements the function with software instead of hardware, minimizes the use of peripheral chips, makes the system have small volume, low cost and power consumption, high integrity, reliability and generality, and these advantages that this system possesses make it have good practical value and application prospects. 