  In terms of the quantitative causal principle, this paper obtains a general
variational principle, gives unified expressions of the general, Hamilton,
Voss, H\"{o}lder, Maupertuis-Lagrange variational principles of integral style,
the invariant quantities of the general, Voss, H\"{o}lder, Maupertuis-Lagrange
variational principles are given, finally the Noether conservation charges of
the general, Voss, H\"{o}lder, Maupertuis-Lagrange variational principles are
deduced, and the intrinsic relations among the invariant quantities and the
Noether conservation charges of the all integral variational principles are
achieved.
