Abstract: Urbanization has exerted the signifcant impact on the weather and climate in the process of human activities to change the conditions of natural environment. The effect of meteorological disasters becomes much denser and more severe due to higher intensity of economic production and human habitation and activities in the mega-city areas. So that, It is urgently to build a science based and service driven observation network to support the seamless data processing, impact based forecasting and to serve further the safety of people's life and property in mega cities. This work discusses a conceptual design and possible application about building an integrated meteorological observation network in megacity based on the achievements of science and technology. It includes the application of variety of sensors, deployment for monitoring high impact and high relevant factors,the application for integration technology and the applications of 'big data' and its associated data sourcing.