i need the data of china's export ,but i found the data in COMTRADE is classfied in SITC or HS,   i hope to know could i get the data classified in ISIC anywhere?   many thanks

 You may want to find the information on UNIDO web sites. Or you can use the correlation tables to convert HS/SITC into ISIC. See http://unstats.un.org/unsd/cr/registry/regot.asp?Lg=1