It is historical inevitability that the creation of knowmetrics is the result of the interaction between social needs and internal development of scientific knowledge system.There are complex relationships among knowmetrics to bibliometrics,scientometrics and informetrics as the close neighboring disciplines.Knowmetrics includes bibliometrics and the main body of scientometrics,however,bibliometrics and scientometrics can not be fully measured by knowmetrics.Informetrics includes full knowmetrics that is the main body of informetrics.Knowmetrics displays the deepening development of informetrics.The research framework of knowmetrics includes two domains,one is on the vertical unit which has five research levels as knowledge blocks,knowledge chains,knowledge communities,knowledge networks and knowledge systems.The other is on the parallel which has five basic research domains as general knowmetrics,knowledge categories metrology,knowledge process metrology,knowledge products metrology and knowledge evaluation metrology.