This paper analyzes the main influencing factors of the guided drilling trace in pipe paving project of trenchless: the angle and area of drilling bit's guide plate, the strata characters, the elastic bending and anamorphic character of the pipe, the size of fore coarse-pitch drilling tools and the advance rate of drilling bit. Taking the mastery of guiding strength as the technical essence and combine the solid geometry with visual C++ programming technique; 3D quantitative and visual computer simulative method has been established innovatively, and has developed relevant software system which has gained actual effect notably.