To quantify the comprehensive effect of multiple factors on the water environment, the calculation method of water environment carrying capacity(WECC)based on dynamic simulation and recursion algorithm and vector norm method is developed and completed. The WECC of the middle-lower of Hanjiang River Basin is analyzed based on this method. The results show that the method is more reasonable in discussing WECC and the results are more explicit and overall. From the point of water supply, there is a risk that WECC of middle-lower of Hanjiang River Basin might not support the local economic development. However, from the point of comprehensive evaluation, the WECC has the tendency of improving gradually.