Abstract: In order to reduce the probability of roof accidents caused by changing lithology, structure and combination of roof rock, the roof peering instrument was used to observe roadway roof to determine rock strength, predict the hidden dangerous area of roof fall, and reasonably design the support parameters of roadway roof. Based on the practical observation on the roadway of 1 000 m in experimental mine, the author optimized the anchor support parameters, strengthened the roadway su pport which was not sufficient, and reduced the excess support, in order to make support reasonable. The results showed that the hidden dangerous area of roof fall in experimental roadway was found in time and the support parameters were improved timely, so that the risk of roof fall was reduced, and 7 383 m anchor was saved. Th e improvement of support parameters according to observation data of roadway roof could improve security of roadway roof and avoid support material waste due to the unknown strength of roadway roof.