The foundation piles concrete durability in a port under construction is field tested by autoclam automatic
permeability tester，and carbonization test，rapid chloride ions migration coefficient test，and the test for freezing resistance
of the core of the foundation piles concrete are carried，the data analysis indicates that there is a obvious relation between the
surface penetration coefficient and durability parameters，the osmotic coefficient could reflect the concrete durability to some
extent. And as a site test parameter of the concrete surface durability，the water osmotic coefficient is feasible.