Nasal fracture is one of the most common conditions in emergency trauma, and lateral nasal photography is the most common clinical examination site to examine nasal fracture. However, in practice, we found that for patients with suspected nasal fractures, simple lateral photography of the nasal bone often does not meet the diagnostic requirements (fracture of that side of the nasal bone), and CT is required to confirm the diagnosis. This brings a lot of inconvenience to the patients, and our hospital has solved this problem better by adding a double oblique nasal bone photograph to the suspected cases. We now analyze and discuss the significance of the clinical diagnosis by adding a double oblique position to the nasal bone photography. Materials and methods 1. Materials GE-AMX-4+ high-frequency X-ray machine AGFA-CR processing system (APC-compact plus, ADC-QS post-processing workstation, AGFA-IP board), AGFA-LR5200P laser printer. All cases were photographed with lateral nasal bone images, and those with nasal bone fractures or suspected nasal bone fractures were photographed with double oblique nasal bone images, with a focal length of 100 cm, 12.5 mAs, 54 Kv, and a double oblique position with the patient in a sitting position and the nose on the photographed side pressed against the IP plate, so that the sagittal plane of the head was 15-25° to the IP plate, and the center line was shot along the root of the nose perpendicular to the IP plate. 3, CR processing parameters acquisition, after correctly inputting the IP plate reading information, the first rough adjustment (size ratio, left and right markings, etc.) and then fine tuning of parameters under the AGFA intelligent software MUSICA. The soft tissue of the nasal bone and the bone texture of the nasal bone can be clearly displayed by the refinement of MUSICA. For the nasal bone fracture or suspected fracture plus the double oblique position of the nasal bone, the specific site of the fracture (left or right side) can be clearly displayed to determine the direction of the fracture gap and the site of the fracture. Discussion 1. The normal nasal bone is thick and narrow at the upper part and thin and wide at the lower part, surrounded by soft tissues and cartilage. The bony nasal cavity is located in the center of the facial skull, between the two orbits and the maxilla, and consists of the pear bone and the vertical plate of the sieve bone, and the nasal bones are small, long, paired pieces of bone, narrow at the top and wide at the bottom, forming the basis of the nasal dorsum. Conventional nasal bone photography is the lateral nasal bone, and the lateral nasal bone image can only observe the presence or absence of nasal bone fracture, when the photography conditions are not appropriate or the fracture site is not easy to show clearly, nasal bone double oblique photography is a better solution to this problem, it can not only show the presence or absence of fracture, but also show the site of the fracture (that side of the fracture), providing an operable basis for clinical post-treatment. 2.The double oblique image of the nasal bone after processing with the intelligent contrast, tolerance adjustment and edge gain of the magnification function of CR post-processing system can clearly display the image of one side of the nasal bone, especially for one side of the nasal bone cortical fracture is not obvious, the fracture is misaligned into the angle, the fracture gap can be clearly displayed, which provides a credible image basis for the correct diagnosis of the physician and is not easy to miss the misdiagnosis. 3, one side of the nasal bone fracture, nasal septum misalignment and other such conditions can only be detected in the CT coronal routine examination of the maxillary sinus, and CT examination is contraindicated or unfavorable to certain specific groups of people (pregnant women and children). A major advantage of CR, however, is that it greatly reduces the dose of X-ray exposure, reduces the damage caused by X-ray radiation, is suitable for specific populations, and reduces the cost of the examination for the patient. In summary, double oblique nasal bone photography under CR post-processing system conditions is significantly more sensitive than simple lateral nasal bone photography for the diagnosis of nasal fractures, with high definition of fracture line display and low photographic conditions, and is a good examination method for determining nasal bone fractures as well as fracture sites.