Trustiness between nodes is becoming more and more difficult due to pa ssive and active attack in multi-domain optical network.To solve this issue,a new multi-domain optical network trust model is proposed which features inner- do main trust and inter-domain trust mechanism,this model is proposed according t o characters of layered- PCE based multi-domain optical network,it builds node t rustiness and domain trustiness by D-S evidence theory,generates rational eval u ation strategy by Game Theory,focuses on evidence generation,evidence distribu tion and trustiness management,at the same time,the trust model′s application is described by an example of path trustiness computation.This model enhances security of multi-domain optical network with lower time complexity and space c o mplexity especially in an insecure environment.Meanwhile this trust model is pr oved to be efficient by experiment,achieved better connection congestion perfor mance compared with simple network trust model.improving blocking probability i s a very difficult topic even for a single digit.This simulation was performed on this new trust model as well as Grid Trust Model in different environment,co mparison results show an average of 1% blocking probability improvement in secur e environment and 5% blocking probability improvement in insecure environment,w hich are very good achievements in optical network.