The combination of optical fiber and coaxial cable is referred to as Hybrid Fiber Coax (HFC) network. The HFC CATV network is considered a promising infrastructure and the most general access path to connect the residential with the Internet. The advantages of the HFC network include using a less number of signal amplifiers, furnishing more bandwidth, and reducing signal attenuation. In this paper, we reported the realization of the Broadband Information System Based on HFC CATV Networks. In such a system, the characteristics of upstream channel noise are the most important. We studied the causes of the noise and interference, and discussed the solution by using Synchronous Code Division Multiple Access (S-CDMA), trellis coded modulation and Interleaver. We used the cable modem equipment based on S-CDMA for the access method, adopted 1550nm and 1310nm fiber optic cables to combined a HFC CATV network and provided Internet services. This Scheme has been used in several districts in Tianjin. It is welcomed for its high-performance and cheaper in prices.