Abstract: Load test is a major test method in deciding ground bearing capacity. And due to fast and convenience in test, dynamic penetration test is also considered to be a supplementary method. So far, relations between dynamic penetration test count and ground bearing capacity, discussed only in some industrial and regional code and construction, are based on massive original test data. Base on theory of dynamic load and take light dynamic penetration test for an example, this article takes similarity between light dynamic penetration test and load test into account, making a discussion over relations between light dynamic penetration test count and ground bearing capacity.