Work plate is a main reason to cause crash accident and leads to death disaster. This study aimed to analyze the fundamental reason for the accidents, and carried out visit survey the 102 construction sites. The results were analyzed for the state of use and installation, and finally an evaluation was performed for the degree of risk of work plate. It is meaningful to quantify the degree of risk by the items to observe when using work plate, in the construction fields using work plate to be expected where there is strong reliability. The results need revision or complementary of related instructions, and could be applied to establish the plan for safety management effectively.