Abstract: By analyzing the performance of power range and intermediate range of the ex-core neutron flux measurement system (RPN), the data verification of the Dynamic Rod Worth Measurement (DRWM) was carried out using the measuring data of the intermediate range. The results show that it can be used as an alternative means to the traditional DRWM. Its measurement error is within the allowable range, and it is unnecessary to measure the background current with the use of DRWM based on the intermediate range of the ex-core RPN, which can reduce the dynamic carving time.