To clarify the origins of materials in the hydrosphere, their distributions and circulation mechanisms, and the links with global environment changes by using trace element concentrations and isotopic composition:

1. Material transport and interaction between the marginal seas and the North Pacific using multi-chemical tracers;
2. Geochemistry of submarine groundwater discharge and shallow hydrothermal system, and its impact on the costal marine environment;
3. Food web analysis in coastal and terrestrial areas and material supply from land to ocean by carbon and nitrogen stable isotopes;
4. Oceanic circulation and variation related to global climate changes: water structure, the abyssal circulation and fluctuation of marginal seas;
5. The origins and long-term transportation of anthropogenic material, and its impact on the marginal seas and North Pacific ecosystem;
6. The monitoring of formation mechanisms of chemical synthesis communities, such as bacterial-mats and methane fluxes in cold seep, gas/oil seep areas;

Scientific Expedition:

Participant in various cruises with over 1500 days at sea, served as a chief scientist on dozens of research cruises, used submersibles and ROVs more than 20 times.