Based on the field and lab measurement on the carrot in harvest time in north area, China, the mathematic statistics and image analytical method were employed to analysis the main geometric properties. The variation rang and distribution frequencies of the carrot’s main geometric properties indexes were found. The tensile test was carried out to test the mechanical properties using software of the Design-Expert Version 6.0.10, the tensile strength of junction between the stem and the root, the maximum pulli...