如何提高在线计算的安全性是科学计算中非常重要的问题。根据实际应用，结合各种方法之优缺点，提出依靠Matlab 系统通过秘密同态和安全套接层来保证科学计算中数据的安全性。并提出基于数据库的在线改进计算模型，借助秘密同态来实现安全算术运算。对如何提高在线安全计算提供了一个可参考的方法。关键词:科学计算秘密同态安全系统 安全套接层Research and Implementation of on-line Secure Computing Yin Chunyong1 Li Jianshi1 Li Shaobo2 (1 Department of Computer Science, Guizhou Univercity, Guiyang 550025;2 CAD/CIMS Institute of Guizhou University, Guiyang 550003) Abstract: How to improve secure computing is a important problem in science computing. This paper analyze dynamic network technique and Web system of Matlab firstly. Then put forward the improvement project of the database for the purpose of the further analysis. It puts a referenced method to how to improve secure computing.Key words: Science computing; homomorphism; Secure system; SSL