<正> The second version of Chinese Evaluated Nuclear Data Library(CENDL-2)isbeing prepared based on the CENDL-1,it will still adopt ENDF/B-4 formatwhich is internationally accepted.CENDL-2 will contain about 50 nuclides eval-uated in China,among them,36 nuclides are from CENDL-1 but will be reeval-uated,the rest are newly evaluated,all evaluated neutron data in CENDL-2will be more complete than CENDL-1,for example,the incident neutron energyrange will be from 1015 eV to 20 MeV,the data type will contain MF 1 to MF5.CENDL-2 also will contain some evaluated data from foreign evaluated nucl-ear data library after reevaluated or reviewed by chinese evaluators.