Abstract: The problem of secure transmission of correlated sources over broadcast channel was studied from the perspective of information-theoretic security. Each source is only for its intended receiver, but to be kept secret from the unintended receiver. Sufficient condition was provided for secure transmission of correlated sources over broadcast channels from separate source-channel coding perspective. If the mutual information was chosen as common information, optimal compression and partial perfect secrecy were both achieved for two correlated sources. Sufficient and necessary conditions were provided for two special cases: a broadcast channel with degraded source sets and a more capable broadcast channel, and thus it could be seen that the separate source-channel code is optimal.