This paper explores the integration of smart contracts and oracles, focusing on efficient information output and system design. It first outlines the basic concepts and significance of smart contracts and oracles in blockchain, addressing the limitations of centralized oracles, particularly in information credibility. An innovative design is proposed to improve the accuracy and security of data transmission. The paper introduces an optimized multi-source information fusion strategy to handle data heterogeneity and uncertainty, enhancing the reliability of smart contract execution. A practical system is constructed and tested through simulations, demonstrating its ability to mitigate risks in centralized oracles while providing real-time, accurate data services. The findings contribute to advancing smart contract applications and blockchain security.