Abstract: The structure, working process and the key parts of 2BSF-4 water saving irrigating-sowing machine were introduced in this paper. Field test results of the machine showed that with average of 137.35 mL water per hole, the qualification rate is 86.7%, the variation rate is 3.03%; the average distance between seeds and the center of wet soil of holes is 11 mm, less than the design distance, which is 20 mm; with average grain of 1.67 per hole, the qualification rate is 97.25%; the space of average grain is 304 mm, the variation rate is less than 3.27%, the pass rate of average grain space is 94.15%; resowing factor is lower than 1.66%, miss-seeding rate is lower than 2.38%. the qualification rate of seeds and water flow into seedbed holes together at the same level is 100%; the test machine is satisfactory for meeting the requirement of design, and quite stable operating reliability is obtained.