Abstract: Static loading test is not only one of the most important means to lay out the structural capability of the precast beams or slabs,but also the common method to measure its anti-cracking capacity and deflection during the loading test. This paper probes minutely into the several factors which have played a great role in the testing result. In addition, the author put forward some suggestions to lessen the error of the result, aiming at the executing on the beam fabricating yard. It is beneficial to enhance the accuracy and reliability of such test method, and it can be as a good reference for similar testing.