In the digital and network age, e-commerce is an important business transaction system. However, the network intrusion, malicious users, virus attack and system security vulnerabilities have continued to threaten the operation of the e-commerce, making e-commerce security encounter serious test. In order to avoid system security flaws and defects caused user significant loss, how to increase security of e-commerce has become a topic worthy of further exploration. The paper investigates critical e-commerce software security requirement (SSR), based on SSR discusses quality impact factors of e-commerce security and proposes a SSR Quality Measurement (SSRQM) model. Combining improvement operation with SSRQM model, the paper establishes a SSR Quality Improvement Procedure (SSRQIP). Applying SSRQIP, the problem and defect of SSR quality can be identified. And assist in timely to adjust and revise the defects of SSR quality, enhance the e-commerce security effectively.