The code method of the yaw and pitch bearing of the wind turbine adopts the code method of the slewing bearing in JB/T10471-2004. However, double-row four-point contact ball slewing bearings appeared in the yaw and pitch bearings of wind turbines. The code of this structure bearing is not specified in JB/T10471-2004, therefore, the code for double-row four-point contact ball slewing bearings has been added to this standard. The structural type code of single-row four-point contact ball slewing bearing is represented by 01; the structure type code 02 represents the structure of the double-row reducing ball slewing bearing; 03 indicates the double-row four-point contact ball slewing bearing structure.