Taking the six districts and new four districts of Tianjin as the research objects, this paper firstly obtains seven landscape types by using morphologically spatial pattern analysis, and extracts the core area patches with good stability, large area, high connectivity and significant contribution as the central "source-sink". Secondly, six spatial data indicators are used to build the evaluation model of thermal environment pattern, and four types of correction coefficients are proposed to correct the basic resistance surface according to the changes of thermal environment pattern from 2009 to 2013 and 2013 to 2018. Finally, the corridors of "source-source", "sink-sink" and "source-sink" are used to build a multi-level "source sink" landscape network that can reflect the process of compensation transportation action. The results show that: (1) there are 27 central "sources" of classⅠandⅡ, with a total area of 22773 hm²;There are 23 central "sinks", with a total area of 50732 hm².The overall anti-interference ability of the central "sources" is small, and it is vulnerable to the influence of planting types and water eutrophication. (2) The total length of the multi-layer "source-sink" landscape network is about 1445 km, and the corridor in new four districts accounts for 70% of the total corridor. The corridors are unevenly distributed in space, with sparse distribution in Jinnan District and dense distribution in Beichen District and the six districts. (3) The gradual flow of energy from the central "source" to the central "sink" can reveal the hierarchical relationship between networks and the regulatory role of corridors at all levels on thermal environment and climate. Constructing a multi-level "source-sink" landscape network system to alleviate the urban thermal environment from the perspective of ecological pattern and process is of positive significance to reasonably plan the corridor construction and efficiently alleviate the effects of urban thermal environment.