According to non-standardized modeling in the system integration of smart substation, a standardized model checking software which checks model files of relay devices is developed to improve the efficiency of system integration. The checking is firstly based on IEC 61850 SCL schema to determine if there are mistakes to lead to analysis fault. A rules bank is built based on relay applying model published by SGCC. The checking also compares the model and rules bank to determine if the definition of logic objects follows the standard of SGCC, such as naming regular, mandatory existing, etc. The checking software is developed using Java/Netbeans and can be compatible to Win32 or Linux platform. The checking software runs quickly and accurately which nicely meets the needs of system integration. An application example is introduced finally, which proves the design of the model checking software is effective.