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3D modeling technology based on laser scanning is an important topic in the field of machine vision research. It has important theoretical and practical value in many disciplines. Traditional guidance system is mainly divided into two types, visual assistant system and visual substitution system. Both of these two types of blind guidance system rely too much on the external environment, such as light, distance, humidity, temperature and so on.Both of them are affected by objective conditions obviously. Therefore, a blind guidance system based on laser modeling technology is proposed，The point cloud and texture information of road surface are collected by laser scannerr;This design use repair algorithm and preprocessing algorithm to improve and simplify the point cloud information ,and generate 3D road condition in real time on the visualization platform; Microprocessor S3C2440 process the characteristic variables in time which is extracted from the processed point cloud data , and makes voice alarm for dangerous road conditions . Experimental results show that the external environment has less interference to the design, and the average feedback time of the system is 0.8s, which has certain application value.