The output has grown stablyCoal tar is a byproduct in coking.Theyield is usually 2.5%-4.0% of coking drycoal and the output is closely related tothe output of coke.The capacity of cokein China has expanded rapidly in recentyears and is already in surplus today.Local governments have taken variousmeasures to intervene.Nevertheless,theoutput of coke in enterprises with con- The output has grown stablyCoal tar is a byproduct in coking.Theyield is usually 2.5% -4.0% of coking drycoal and the output is closely related tothe output of coke.The capacity of cokein China has expanded rapidly in recentyears and is already in surplus today .Local governments have taken various measures to intervene. However, the output of coke in enterprises with con-