The method that anchor structure is divided into fixed length, free length, and anchor head using industry standards and engineering practices, but it has been found that this approach cannot meet the requirements of anchor technology development. Therefore, another method is suggested in this study that employs a body rod as the anchor will be divided into bond, non-bond and tension lengths. Erroneously employing in the bond length as the fixed length has been the rule in numerous engineering projects. The functions between the fixed length and bond segment are different, so the free and non-bond segments cannot be confused. The packer is the key physical element that distinguishes the fixed length from the free length, the start-stop position and fixed length are unknown without a top-grouting plug, so that the fixed length is often not accurately designed or calculated. The tension-type anchor is partially characterized by a tension-compression anchor and, in practice, is the actual position of the packer. To ensure the fixed length of the anchor outside of the assumed stability slip surface and within the stability of the soil layer, the packer should be set outside of the assumed stability slip surface at 1~2 m.