Usually the intermediate results can hardly be obtained in the simulation process from the business architecture (ARC) simulator since its source is non-open. A method based on key data region monitoring was proposed to distill the value in the key region of ARC simulator automatically when it is running. In this way, the results from ARC simulator and RTL simulator can be cross-checked to help the verification engineer debugging the RTL codes quickly and efficiently. Compared with the traditional method, it can speed up the error checking by one order of magnitude according to the experiment and real chip design.