三塔悬索桥整体刚度低，中塔选择对整个结构的受力有非常显著的影响。中塔的设计需要解决主缆在塔顶抗滑移安全系数问题和主梁跨中挠跨比问题这一对矛盾。文章介绍了泰州大桥中塔的受力特点和结构行为，在此基础上对其进行了结构选型，最终采用了纵向人字型的全钢索塔。介绍了钢塔的结构设计和对主要关键构造的处理和设计细节，包括厚板的焊缝设计、分叉点的结构处理、塔底钢塔柱与混凝土承台的连接方式及构造，以及根据起吊能力而进行的塔柱纵向分块设计。

The total stiffness of a three-pylon suspension bridge is relatively small. The middle pylon structure of a three-pylon suspension bridge has great influence on the mechanical behavior of the whole bridge. The contradiction between the slip factor of main cable on the top of pylon and the ratios of the deflection to span of the bridge needs to be solved. Based on the analysis of the characteristics and structural behavior of middle pylon of Taizhou Bridge, structure selection of the pylon is done and longitudinal herringbone steel pylon is taken. The structure design of steel pylon and process with key structures, which include weld design for thick plates, structure dispose of branching nodes, connection type between the bottom of steel pylon and concrete bearing platform are introduced. The longitudinal blocking partition design based on crane capacity is also introduced.