A novel system to transmit multimedia data with optical code-division multiple-access(OCDMA) system is given.The new system can support multimedia data without changing encoder and decoder even though the user data rate is not the same by twice modulation,the first time to modulate clock,the second time to modulate data.We discuss the performance of BER of the system with two different data rates,the system performance is no worse than that of same-rate OCDMA system.Finally the relevant experiments have been done to verify the theory.The result shows that it is a simple and flexible system to support multimedia signal transmission.