Reasonable installation of series reactors can effectively limit the short circuit current, but it will also have some influence on the characteristics of short circuit current. The impacts of series reactors on the periodical component of short-circuit current, DC component, peak current and current zero offset are analyzed, and the verification standard of breaking ability and making capability of circuit breakers are evaluated combined with power grid connection and operation status. The results show that the larger the series reactor is, the smaller the short circuit current, and the sensitivity of short circuit current to series reactor is also smaller. In addition, when the bus tie reactor increases to a certain value, the short-circuit current zero offset will occur. It is also advisable that when the series reactor is installed to restrain the short circuit current, the DC offset may decay much slower that the breaking capability of the circuit breaker be verified by the total short circuit current RMS.