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If the standard is required in the basic requirements of the project (such as cement concrete pavement) and the inspection project requires testing, it must be tested. If the design requires otherwise, or the supervision engineer needs according to the construction control, inspection should also be carried out. For asphalt pavement on rigid and semi-rigid base, it is only necessary to detect the deflection value of the top surface of subgrade and the upper layer of pavement, which can meet the needs of quality inspection and evaluation. Because the deflection value of the top surface of the roadbed shows the bearing strength of the roadbed, it is the basis for judging whether the pavement construction can be carried out; The bearing capacity strength of rigid and semi-rigid base is expressed by the strength of core samples drilled on site after construction. As long as the strength of the sample meets the design requirements, it is considered that the bearing capacity strength meets the design requirements, and it is generally unnecessary to detect the deflection value. For asphalt pavement, because the design deflection value is the main basis for the quality control index and quality inspection and evaluation of the top layer of pavement, when the pavement is divided into several layers, only the deflection value of the upper layer can be detected, and the deflection value of the upper layer reflects the comprehensive strength of the bearing capacity of the whole pavement.