The author uses the rigid and flexible loading method,respectively for pressure box calibration of coarse-grained soil,which is the first sand pressure calibration method and the second sand pressure calibration method,and designed a new methods of pressure box calibration of coarse-grained soil which is the first sand pressure calibration method comparing with them.Study found that except that the first sand pressure calibration method obviously can not be applied to practical because of the high discrete rate of the calibration curve,the second and third sand pressure calibration method have a low discrete rate of the calibration curve,which can meet the accuracy of laboratory test and engineering application requirements.Then,through the large compression experiment in door,the author study applicability of the second and third sand pressure calibration method and water pressure calibration method that manufacturers provide and the author have improved,The results show that,the second sand pressure calibration method and improved water pressure calibration method are applicable to the count of soil pressure.