With the development of social economic, China will become the country which has the longest Metro line among Countries in the world soon. It is necessary to research Metro rescue system using wireless sensor network (WSN) because of the special geographic structure, such as a larger flow of people, higher automatic service systems for Metro environment. This paper proposes to establish Metro environment rescue systems using WSN which has obvious advantages in information acquiring. Key technologies for monitoring data transmission are explored, including data collection strategy of the sink, data transport control protocols, and the QoS of the rescue system using WSN. It could remedy the deficiencies in current Metro service system now.