Abstract: In order to solve the problems of low detection efficiency of existing channel hidden danger detection methods of transmission line GIM（grid information model） model and missing detection of optimization algorithm, a fast detection method of channel hidden danger, which is based on the principle of equal line length point aggregation and sphere inclusion, is proposed. Firstly, according to the equal line length interval sampling, the conductor is transformed from the spatial curve to the discrete point set, so that the discrete point set is evenly distributed on the power line, so as to solve the problem of uneven distribution of discrete point set and poor accuracy of special gear in the traditional equal level interval sampling method; Secondly, in the process of batch point hidden danger detection, the sphere inclusion principle is introduced to judge the potential hidden dangers of ground objects, and the adjacent point search calculation is skipped for the ground objects that do not have the potential hidden dangers, so as to realize the rapid detection of channel hidden dangers. Experiments show that this method can ensure the distribution of sampling points in both ordinary and special gears, and control the positioning tolerance of the nearest point within the target range; In terms of detection efficiency, the hidden danger detection time can be optimized to 6.9% of the original time on the premise of ensuring the detection accuracy.