## 1 Introduction  
In recent years, with the rapid development of manufacture level of satellites, launch technology of rockets, and interstellar communication technology, the role of the Space Information Network (SIN) is more important to national defense and people's livelihoods [1; 2; 3]. There are many countries of the world that are fully aware of the important role of SIN in international competition and national economic development. They are actively carrying out research in relevant areas, especially in countries such as the United States, Russia, and Japan [4]. The SIN is developing from the space-based integrated information network, space-based information system, and space information system [5]. As a complex information system, the SIN is the main platform for information support, and it is the important infrastructure for situational awareness. Since 2013, the National Natural Science Foundation of China has carried out a major research project on the \"Basic Theory and KeyTechnologies of Space Information Networks\" [6]. For the scientific issues of network architecture, dynamic information transmission theory, space information characterization, and space-time fusion in SIN, the research teams from Wuhan University, Tsinghua University, Hong Kong Polytechnic University, Nanjing University, and the Chinese Academy of Sciences, and so on, have done a lot of in-depth research, and they also have achieved considerable results [5; 7; 8; 9; 10; 11; 12]. Relating these results to the current research situation, although the scholars have studied the above-mentioned scientific problems from different angles, the development of the SIN is still in the primary stage. Meanwhile, there are still some scientific issues to be studied further, including: (1) the architecture models of SIN being poor in standardization, versatility, and portability; (2) the lack of research results regarding the topology evolution model of the SIN; (3) the lack of a visualization system to assist users to build, develop, maintain, and manage SIN. For these problems, we have carried out the research on the topology evolution model, and the interactive visualization system of the SIN in our previous work [13; 14]. However, for the architecture models of SIN, we have proposed a Data as a Center (DaaC) modeling idea, and the DaaC modeling idea can solve the problem of the poor versatility and portability of the SIN architecture [15]. In this paper, for the problem of recombining the existing architecture modeling methods of the SIN, we propose a reconfigurable modeling method of task-oriented architecture of SIN based on the DaaC idea. Architecture is originating from the meaning of design and construction in architecture, and later it is introduced into computer technology, system engineering, and other fields [16; 17; 18]. The definition and understanding of architecture is also constantly deepening and perfecting. Up until now, the academic circles have thought that architecture refers to the structure of the network or system and its mutual relations, and the principles and guidelines to guide the design and development of the network or system [19]. For example, in the construction of the C\({}^{4}\)ISR (Command, Control, Communication, Computer, Intelligence, Surveillance, and Reconnaissance) system, the United States (U.S.) military requires that the architecture of the system be designed first. Moreover, the corresponding investment and development plan ought to be determined according to the system architecture, in order to guide the development and construction of the C\({}^{4}\)ISR system [20; 21]. Through analogy with the SIN, the architecture is the blueprint of its construction and development throughout its life cycle. Meanwhile, it is also an indispensable link for the construction and development of the SIN. Through the joint efforts of scholars in recent years, for the modeling issue of SIN architecture, there are some basic methods.