Two kinds of test-blocks on concrete joints of trapezoid and arc were made by the method in which one half of test block was cast firstly, and the other half was cast a month later. Concrete joints impermeability test was carried out using existing test instrument, and impermeability grade of the test blocks was determined. Test result showed that both impermeability grades of concrete joints for trapezoid and arc can arrive at S2, have impermeability effect in some degree; the trapezoid-joint impermeability is slightly better than the arc-joint. The method can be a reference to amendment of correlative criterion.
