European powers trampled international law for scrambling power and hegemony in the 19th century,which gave rise to the fact that the function and effect of international law were greatly limited.For this,Marx and Engels strongly criticized the European powers' behavior of violating the international law,and revealed the function and effect international law should have: stressing that international law should protect the normal relations among states;that international law should regulate western powers' international behavior;that international law should support national liberation movement;that international law should help to create new international order.