PSD-CCP and PSASP are two commonly used software for short-circuit current calculation at present in domestic,however,the calculation results differs under different calculation conditions,affecting power grid planning and decision-making.With consideration of three standards for short-circuit current calculation,differences between them are analyzed,then some factors such as line and transformer resistances,line capacitors,reactive power compensation and static load affecting short-circuit current calculation results are analyzed theoretically combined with the equivalent circuit.Finally,six different short-circuit current calculation methods are adopted based on PSD-SCCP and PSASP using Jiangsu power grid planning architecture in some year during 2016-2020 as an example,and recommendations are put forward through comparing the calculation results,in order to provide reasonable reference and ideas for short-circuit current calculation in power grid planning and the early stage of project design.