This study analyzed the trend of construction accidents focused on the small-scale construction sites and the correlation between the ratios of official inspection by government and total fatality injuries per 10,000 people (TFR) by construction size in Korea. The method is to analyze statistical data for the construction accidents and official safety inspection system. In construction, accidents rate and TFR are recently increasing unlike other industries. In addition, the smaller the scale of construction sites, the higher the TFR, and vice versa. The smaller the scale of construction sites, the greater the degree of difference in the TFR for each year, and vice versa. In small-scale construction sites, which have amounted less than $273,000 (£231,000), approximately 45.7% of deaths occurred on sites between $36,400 (£30,800) and $182,000 (£154,000). The ratio of inspection, which represents the ratio of official inspection proportion to site share, is in inverse proportion to the TFR by construction size. As the ratio approached zero, TFR became higher, and the higher the ratio, the lower TFR since the official inspection was mainly carried out in medium and large-scale construction sites. To get an effect of official inspection, the focus of official inspection should move onto the small-scale construction site.