Abstract: In order to study the chloride binding capacity of concrete in west chlorine saline soil region, high concentration sodium chloride solution was used and long term immersion test of concrete was performed. Some contents were analyzed, such as distribution of binding chlorine, relation of binding chlorine and free chlorine, changes of chloride binding capacity along diffusion depth and immersion time, and the influence of environment on chloride binding capacity. The results show that binding chlorine content increases firstly and then decreases along diffusion depth, and that content peak exists. Ratio of binding chlorine and free chlorine is 56% in the same diffusion depth. Test values of chloride binding capacity fluctuate with diffusion depth and immersion time, they are different from ones in the other environment and affected obviously by the environment.