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In order to obtain the criteria for preventive maintenance of cement pavement in military airport, based on the basic assumption of flatness-dynamic load interaction in the decay process of cement pavement, derivative inflection point is adopted. The method solves the relationship between the International roughness index (IRI) and the pavement damage index (L), and obtains the IRI critical value of the cement pavement when the L decay is the fastest. After the analysis and verification, the judgment standard of the cement pavement IRI is obtained. This paper analyzes the related research results of the preventive maintenance standard range of pavement condition index (PCI), summarizes and concludes the judgment standard of pavement PCI, and gets the PCI-L relation based on L-IRI and PCI-IRI relation, and finally gets the judgment standard of L. Based on the current situation that our army still mainly adopts the three-meter ruler for flatness test and a large number of measured data, a three-meter ruler average gap and a pavement IRI correlation relationship are established, which realizes the conversion between the two. Based on the current situation of less accumulation of performance test data of cement pavement in military airport, the damage condition and flatness data of several cement pavement in similar environment are fitted and analyzed by using the method of space generation time, and the specific parameters of the model are obtained.