2. Pre-sales engineers are required to be more familiar with technology implementation and project management than users' business. Because the user's original demand has high certainty, it is only necessary to show the company's technical and project management strength in a certain project by analyzing the original demand and combining its own technical knowledge and project management knowledge. Pre-sales consultants have higher requirements for users' business and management, that is, more often, pre-sales consultants are collecting, counting and analyzing users' current business and management data, and providing users with a set of well-founded and profitable information strategies and return on investment reports through the use of these data.