Fractures in rock masses are important for the study of a whole range of rock mechanics and rock engineering issues including evaluation of the rock mass geometry, analysis of the Excavation Damaged Zone (EDZ), understanding the rock mass behaviour and response to excavation, numerical analyses, and reinforcement/support design. A digital borehole camera records a continuous, magnetically orientated digital 360 colour image of the borehole wall, making it possible to directly observe lithological changes in the rock mass and its contained fractures (Paillet et al. 1990; Pusch 1998). Fractures display sinusoidal curves on the flattened image, enabling the strike and dip of the fractures to be determined directly from the images orientated to North (Kamewada et al. 1989; Wang et al. 2002; Williams and Johnson 2004). The technology has been widely applied in geological exploration, especially in petroleum (Maddox 1998; Tague 1999; Palmer and Sparks 1991), mining (Gochioco et al. 2002; Deltombe and Schepers 2000), Glacier (Engelhardt et al. 1978), geotechnical and environmental engineering (Lau et al. 1987; Miyakawa et al. 2000; Lahti 2004; Cunningham 2004; Cunningham et al. 2004; Schepers et al. 2001; Roberson and Hubbard 2010; Uchita and Harada 1993; Li et al. 2012a). It has also been used to observe crack development and fracture evolution around underground excavations, contributing to the establishment of the EDZ characteristics (Li et al. 2012a, b; Yuji 1983). There are two main types of digital borehole camera used: the first is a digital optical televiewer, such as the OPTV (Optical Televiewer), OTV (Optical Televiewer) and OBI-40 (Slimhole Optical Televiewer) (Williams and Johnson 2004; Lahti 2004; Cunningham 2004; Cunningham et al. 2004; Schepers et al. 2001; Roberson and Hubbard 2010); the other is a digital panoramic borehole camera, such as the DIPS (Borehole Image Processing System) and DPBCS (Digital Panoramic Borehole Camera System) (Wang et al. 2002; Wang and Law 2005; Williams and Johnson 2004; Uchita and Harada 1993; Li et al. 2012a). The main parameters of these two kinds of camera are listed in Table 1. The first digital camera was developed as a stand-alone system in 1987 (Williams and Johnson 2004). Since then the tool has gradually become a standard tool. Although there are different types of digital camera system, the basic principle, components and operations of these test systems are almost the same. Thus, this Suggested Method describes the observation of fractures in a rock mass and the identification of EDZ. The apparatus and operating procedure are presented together with the possible ways of reporting the results. The recommendations are supported by case example data.