Stable isotope analysis is widely used in dietary reconstruction, host\|shifting and migration, flows of mass and energy through ecosystems, and construction of food web.

In this paper,the theoretical basis and advances for the application of stable isotope analysis to seagrass ecology research in recent 20 years are summarized,and the prospects for the stable isotope data analysis,the application of stable isotope analysis to seagrass pollution ecology and the use of seagrass δ~(15).

Because of the special feature with the multivalences,multi-mass number and larger isotopic fractionation,Se isotopes have caused more attention.

The isotopic fractionation under microbial actions belongs to the kinetic isotopic fractionation,which results in the enrichment of heavier isotopes in .

There exist possible isotopic fractionation effects in generation-expulsion process of terrestrial source rocks.

Through acetone via 2,4-dinitrophenylhydrazine(DNPH)derivatization,it was found that isotope fractionation values were so little as to be ignored during the whole reaction process,the derivatization process showed that no carbon isotope fractionation occurred for acetone within the precision limits of the GC/C/IRMS system(<0.

The researchful status of the isotope fractionation the stable isotopes in tracing to sources and trailing pollutant,specially in apportioning the atm.

In addition,the experiment working standard of H2 was certified by H2 /H2O(l) equlibrium H/D isotope analysis associating with hydrogen isotope fractionation equilibrium.