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Since the release of the 13th Five-Year Plan, the construction plan of the smart city and Internet of Things (IoT) has once again pushed the sensors into the limelight. In the current situation, whether in China or around the world, the construction of smart communities has become an irreversible trend. In this environment, the sensor as a smart city "bridge" will certainly usher in an industrial explosion. "Smart city" is a new concept and model for urban development. Academics have also explored the concept and theoretical model of smart cities from different perspectives in different forms. With the gradual establishment of the national smart city system, the Internet of Things and other technologies are being widely used to serve other aspects of human social life, such as urban smart communities, intelligent transportation, and intelligent home security systems. The application of technology is gradually penetrating into the life of our human society. In the context of building a smart city, scholars have also brought an unprecedented broader idea. By seeking a reasonable balance between human and urban nature, the concept of "park city," which aims to create a good ecological habitat where people and nature can coexist and develop in harmony, has emerged as China's urbanization process accelerates and the conflict between people and land becomes more and more prominent. As an important factor to promote the harmonious development of humans and nature, the planning and construction of urban parks is an important means to meet the needs of people for a better life and to improve the ecological environment of cities; therefore, the planning and design of urban parks under the concept of "park city" is getting more and more attention. Qingdao, as a typical coastal city, has a mosaic of green areas and urban construction land, so urban ecological parks with the carrier of nonconstruction land exist in large numbers in the city and become a key link in the practice of the "park city" concept. However, while urban ecological parks provide ecological and social services to citizens, their special land use has also led to a series of problems. At present, there is not enough basis for the planning and management of such special parks in Qingdao, and it is not possible to guide the planning and construction of such parks with universal standards, so how to effectively protect and reasonably utilize them to promote the construction of "park city" is an urgent problem to be solved. Based on the above background, this study takes Qingdao urban ecological park as the research object and summarizes the typical problems in the process of planning, construction, and use of this kind of park through relevant data research and extensive studies. Based on this, we propose three aspects, namely, the location and layout of parks at a macro level, the construction of the park system at meso-level, and the design optimization of parks at a micro level. The specific research content includes the following aspects: the first part defines the background, purpose, and significance of the topic and the research object and summarizes and reviews the existing research results at home and abroad, and then proposes the overall idea and framework of the research. The second part analyzes the problems of Qingdao urban ecological parks with the concept of "park city." Based on the connotation and characteristics of the "park city" concept, the impact of the concept on urban parks is analyzed, and the significance of the "park city" concept on the planning and construction of urban ecological parks is clarified based on the special characteristics of urban ecological parks. Finally, we provide the basis for the proposed strategy by combining case studies at different levels. Finally, we propose a better spatial planning for the construction of a park city in Qingdao using smart detection sensors and other means of building a smart city. [ABSTRACT FROM AUTHOR]