迈入21世纪，外科发展主要的方向是细致微创，微创手术在胃肠道肿瘤的治疗中占据越来越重要的地位。腹腔镜系统经历了二维(2D)成像系统、三维(3D)成像系统，但二维(2D)成像系统缺乏足够的深度感，三维(3D)成像系统首先能够呈现传统手术的立体感、层次感；其次可减少对患者的生理创伤，使手术更精准、更安全；再次可以降低初学者的学习曲线。

Entering the 21st century, the surgery develops into minimally invasive surgery.Minimally invasive surgery is becoming more and more important in the treatment of gastrointestinal tumor.Laparoscopic system has experienced two-dimensional(2D)imaging system and three-dimensional(3D)imaging system.But the two-dimensional(2D)imaging system lacks depth perception.First, three-dimensional(3D)imaging system can bring the stereo feeling.Second, it can reduce the patients' physical trauma, make surgery more accurate and safer.Third, it can reduce the beginners learning curve.