Abstract: Based on the related data of marine ecological security of Shandong Province from 2002 to 2012, this paper constructed a marine ecological security evaluation system for Shandong Province from three aspects which were ecological security, economic security and social security. And then used the BP-ANN model to make a evaluation for marine ecological security, and at last made an analysis of marine ecological security according to the evaluation index. The results are shown as follows: (1) BP neural network method is a feasible marine ecological security evaluation method, which can be well fit the marine ecological security system's development evaluation. (2) In terms of each subsystem's security degree, the ecological security system showed a upward trend, while the economic and social security system both showed a downward trend. (3) Overall, the security level of Shandong Province in 2010 and 2011 were both general safety, and it was criticality safety in 2012.