All over the world, there are many institutional programs used to enhance the safety of vehicles. The NCAP is a program that assesses the safety of vehicles sold by manufacturers in order to provide consumers with information on vehicle safety and to induce them to produce vehicles with enough safety. In Korea, the KNCAP has been carried out continuously since 1999. However, the fatal rate from traffic accidents per 100,000 population in 2017 is 8.1, which is above the OECD average. Therefore, it is necessary to improve various systems, but it is also necessary to improve the crash assessment protocols reflecting the actual accident. The purpose of this paper is to improve the crash test protocols of KNCAP by analyzing the status of the serious injury in case of an accident in Korea. Accident data were used for the latest three years(2015-2017) in car to car accident of domestic insurers. Raw data shows that 9,399 cases occurred due to accidents involving more than MAIS3 + of occupants' injuries. Of these, 279 cases were analyzed. In the collision type, the full width impact was the largest at 68.5%, and the small overlap and moderate at 28.3%. The low severity with 0 failure depth was 2% and the center impact was 2%. Impact angle was 51.1% for co-linear, 33.3% for left oblique angle and 15.6% for right oblique angle. In case of overlap, moderate overlap was about 47.9% and small overlap was about 17.5%. In the case of full width, crash extent3 + was 80.6%, while moderate overlap and small overlap were 36.8% and 24.3%, respectively. The collision type and impact angle compared to other country.