The pulse current measuring equipment consists of digital oscilloscope and current probe， with the error limit of 1%. This error limit shows some defects when the measurement of the pulse current requires higher accuracy. The major sources of error is found out based on the aforementioned equipment in this paper，and an advanced method is put forward，which can decrease the component of error. In this advanced method, the pulse current is replaced by direct current(short for RDC). In addition，the working principle and method of RDC are illustrated in detail. Through the comparative analysis on the uncertainty with the former method, the proposed method has better operability and higher accuracy.