Dynamic Spectrum Access (DSA) network is envisioned as a promising candidate to significantly improve the spectrum utilization. Due to its specific features of the DSA, however, this network is more vulnerable to security attacks than the traditional wireless networks. And channel jamming is a one of main threats to DSA networks. So far, limited works have been done in mathematical and formal modeling of the channel jamming. In this paper, we present the attempts to analyze the channel jamming behaviors in DSA networks in order to find a relationship between the number of channels, secondary users and attackers. The research focuses on jamming performance analysis in various architectures, that is, a simple DSA network and a complex DSA network with varied situations. Comparisons between theoretical and simulation results in Matlab verify that the modeling and analysis are valid.