Integrated Sensing and Communication (ISAC) is a mobile communication network superimposed on sensing capability that senses the position and speed of a moving target while performing communication. Compared with the traditional radar, ISAC has the advantages of ubiquity, seamlessness, and scale, and has been identified by international organizations as one of the three new core capabilities of 5G-A/6G, which can be used in many scenarios, such as the national low-altitude economy, security management, and social governance. Nevertheless, in the process of engineering from theory, ISAC still faces many challenges, how to realize the continuous coverage of the communication and sensing, and how to improve the performance of the network under the complex interference environment are the difficult problems that need to be solved urgently. In this paper, we start from the link difference between sensing and communication network, give the link budget theoretical formula of sensing network, further analyze the interference sources and characteristics of sensing network, and put forward the low-cost continuous coverage network structure as well as the interference solution, and finally give the preliminary validation results of the field test, so as to provide the theoretical basis and practical guidance for the further development of the sensing network technology and industry.