Distributed heterogeneous IT systems of group enterprises require global integration solutions. This article proposes a Web service middleware platform architecture based on SOA architecture, which provides unified data/business integration, service development and orchestration tools, and supports authentication/authorization of cross-domain service access and distributed service transactions. Keywords: Group enterprises; Web service orchestration; Security; Transaction The process of enterprise informatization has achieved considerable development and results in my country. A large number of enterprise software systems have been widely used, and new problems have also arisen: multiple systems are tightly coupled in a non-standard form, which makes integration difficult and hinders future development and updates; the system is difficult to flexibly respond to business changes; management functions are limited to multiple program domains, making it difficult to achieve macro-scale monitoring and regulation; etc. Group enterprises often deploy multiple types of business systems in multiple companies/branches in different locations, and the above problems are particularly prominent; and due to the limitations of external conditions such as the network environment, the system integration of group enterprises also faces special challenges in many aspects such as security, efficiency, and scalability. This paper attempts to propose a middleware solution based on Service Oriented Architecture (SOA), which realizes the integration of multiple heterogeneous business systems of group enterprises by building a loosely coupled heterogeneous system integration service platform, while inheriting the enterprise\'s existing IT assets and providing rich management functions and good future development space. The platform focuses on the use of key technologies such as service encapsulation, orchestration and management to achieve data and business integration of group enterprise data.
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