Abstract: From the perspective of thinking and methodology, this paper introduces the challenges that existing network technical system development paradigm is encountering, analyzes their respective presuppositions and universal application categories, and points out that some assumptions and implementation norms that were originally considered reasonable have now become insurmountable genetic defects when facing strong diversified application scenarios.Hence, under the conditions of today's technology level, network security, engineering capabilities, and diversified application requirements, the current “single network system evolution or replacement冶methodology has severely restricted the development of network technical systems and service capabilities.Therefore, it is urgent to propose a new paradigm for the development of network technical systems based on new thinking perspectives and methodology in order to adapt to the requirements of the era of diversified networks and diversified application symbiosis and coexistence, evolution and change, and compatibility of functional safety and network security.The introduction of the paper briefly describes the scientific definition of the paradigm, the first part is a brief review of the network technical system development paradigm, the second part briefly explains the predicament of the existing network technical system
development paradigm, the third part gives the origin of the polymorphism concept and the interpretation of network polymorphism, and the fourth part proposes a new development paradigm which separates network technical system from the supporting environment.

Key words: development paradigm of network technical system, network polymorphism, the separation of technical
system and supporting environment