In order to satisfy the stability and use requirements of the superstructure，one or more acceptance indexes（liquefaction judgment，relative density，etc.）are often specified in the design of the foundation treatment on sand soil. How to judge that the treated foundation meets the acceptance index is the key problem. In view of the above problems，the correlation between the in-situ test data and the acceptance index is often established in engineering，and the empirical formula is obtained. In this paper，the acceptance curve（which satisfies the relationship between the minimum cone resistance qc and the soil depth）is determined comprehensively by comparing the commonly used formulas for calculating sand indexes based on CPT at home and abroad. The results show that：1）The effective internal friction angle and bearing capacity are not considered as the controlling factors while the relative density of sand is satisfied. 2）If the post-construction settlement does not meet the requirements，the acceptance criteria based on the relative density requirements should be appropriately raised. 3）CPT can provide continuous curve of soil layer data，and there is abundant data between it and soil properties. 4）The acceptance index based on CPT calculation can provide guidance for the foundation treatment technology.