The electrical clearance and creepage distance of electrical products is an important test in electrical safety testing, aiming at the problems that the testing personnel do not understand the standard in place, can not find the shortest path and the measurement results are not accurate. Based on the technical analysis of specific examples, this paper introduces the methods and skills of bridging, plane folding, making the shortest straight line or vertical connection, reasonably selecting the optimal path of electrical clearance and creepage distance, and then using the combination of direct measurement method and calculation method to accurately calculate the measurement results. The results show that this method is very accurate and efficient for solving the two difficulties in the test of electrical clearance and creepage distance: selecting the optimal path and accurately calculating the measured value, which has strong practicability and reference significance.