Calculation of charging load is the basis of studying the impact of electric vehicles (EV) on power grid and planning of charging facilities. This paper proposes a calculation method for charging demand considering the state of health (SOH) of the battery. Firstly, the probability distribution of the characteristic quantity of the charging load related to the EV travel chain is used to enable the complete simulation of the travel behavior of a single EV user. Secondly, the actual capacity and charging characteristics of EV are adjusted based on the battery health state, and the user's mileage anxiety coefficient is proposed to adjust the minimum state of charge (SOC) value remaining after next trip and to improve the charging load calculation model. Finally, the simulation based on the basic data of the national household travel survey (NHTS) shows that SOH affects multiple characteristics of EV users' travel. The larger the EV scale, the more SOH should be considered in the calculation of charging load.