Despite the abundance of successful software within the industry, code components in legendary software do not lend themselves to reuse like "mechanical parts" in manufacturing. As a result, similar and subsequent software development still requires "starting from scratch, redeveloping." Software project development is costly and has low productivity, making it impossible to resolve the software crisis. Currently, internet search provides a means for reusing knowledge and experience, but traditional software development only has programming methodologies oriented towards machines, processes, structures, objects, components, aspects, agents, and services. It cannot utilize search to support and assist in software engineering. This project aims to research and apply a programming methodology based on precise deep code component search guided by credible reuse. It begins with refining credible characteristics from the behavior of program components, including functional satisfaction, behavioral consistency, quality reliability, Program security, etc., form credible standards, provide a set of rules and protocols for component refinement, identification, granularity division, performance evaluation, and mutual interfaces, and design online and integrated behaviorally credible verification algorithms. Explore the organization and construction methods of massive code component libraries, and propose precise and deep search algorithms for credible components that combine program code syntax and semantics. Analyze programming requirements and systematically propose program logic structures and programming specifications based on search-based programming. Focus on designing and developing corresponding auxiliary tools for search-based programming, publish them on the internet, use mobile park guide software development as an application demonstration, and promote it to a wide range of software companies and programmers. Ultimately, achieve an improvement in the accuracy of code component reuse search by more than 80%, greatly enhance the efficiency of software development, and effectively support the development of the software industry in the 'Internet +' era.