Geotechnical engineering investigation is the basis of infrastructure of building, it provides basic guarantee for engineering construction. The working methods based on relevant standards mainly include engineering geological drilling, in situ testing, field sampling, indoor soil test, engineering survey of exploration point, analyze and prepare geotechnical engineering investigation report, means to identify the building site and engineering geological conditions of the subgrade. In construction industry such booming today, geotechnical engineering investigation industry has obtained constant progress and ongoing optimization. While the quality of the implementation of the survey, however, there have been quality problems. According to the actual situation, this article analyzed the master factors that affect the quality of outcome of geotechnical engineering investigation process for the exchange of industry.