The improvement and extension suggestions for IEC61970-301，IEC61970-453，and graphic description specification for electric power system submitted to international electrotechnical commission（IEC）by China are proposed.A general substation layout model is proposed to cope with the model，data，diagram consistency design of substation one-line diagram and its auto-generation.In data model of common information model（CIM），under the existing equipment container，parallel with bay，voltage level，substation，a new class of bus container composed by bus bar and bay is added.In the meantime，main transformer is dissolved as winding bay，which joins and becomes the element bay of bus container.Apart from that，two property classes，namely bus bar container and bay，are added to make sure that in any case one to one correspondence is among data record and corresponding sub diagram.The diagram model，from bottom to upper，is composed respectively of conducting equipment cell，equipment diagram，bay diagram，bus bar container diagram，voltage level container diagram，substation diagram，which forms a hierarchically assembling diagram system，making automatic generation for the whole substation diagram more easier.