In waterway regulation engineering，the cement mixing pile is affected by the flood season and the inspection period is relatively short. The currently commonly used static load test method and borehole core method cannot achieve the purpose of rapid inspection. Relying on a waterway regulation engineering in the lower reaches of the Yangtze River，we carry out the field standard penetration test and the indoor unconfined compressive strength test，establish a calculation formula based on the numbers of standard penetration and pile strength under different soil condition，and establish the relationship formula between different standard penetration numbers based on the growth law of cement soil age. The test results show that the standard penetration number of cement mixing pile and the unconfined compressive strength has a good linear relationship，and its linear parameters are closely related to the soil properties. The strength of the pile can be obtained through in-situ standard penetration tests to improve detection efficiency. The relationship between 7 d and 28 d standard penetration numbers is linear as N28=1.12N7+13. The relationship between 7 d and 90 d standard penetration numbers is the quadratic function as N90=-0.16N27+7.9N7-30. These formulas can predict the construction quality of cement mixing piles in the early-stage and accelerate the progress.