Said invention refers to concrete gaseous permeability coefficient annular tester and testing method belonging to concrete material viability detection technique field. It contains cover board, housing, flowmeter, seal ring, and tested sample, wherein cover board housing top, tested sample located in housing with cylindrical form outer wall, inner hollow, toroidal shape cross section, U shape longitudinal section, sealing gasket set in top and bottom of tested sample, one housing side air inlet connected with compressed gas tank, cover board centre with connection porthole, hollow part of tested sample connected with flow instrument through said connection porthole. In testing, tested sample is located in housing, opening compressed gas tank valve, testing sample air permeability, keeping tested sample equilibration time being 10-20 minute, each group tested sample repeating by 3-5 times, changing test pressure and repeat testing, testing tested sample gas flow to obtain tested sample permeability coefficient average value, taking 3-5 tested sample permeability coefficient average value as test value of said group tested sample. Said invention has high accuracy, fine testing repeatability, fine sealed effect, reliable test result, easy and simple to handle etc advantages.