1. To draw Qian Qihu's stick figure, we must first know his image characteristics and clothes. Qian Qihu usually wears a pair of glasses with thick eyebrows and short hair. He is of medium height, neither fat nor thin. In terms of dress, he often wears a white shirt with a dark tie or bow tie, and a pair of black pants below.

2. We can start to draw stick figures. Draw a circle as Qian Qihu's head, and then draw his face and facial features on the basis of this circle. In order to show his glasses, you can draw two rectangles on his face and add two horizontal lines inside to show the frame.

3. Draw his body parts. Because it is a stick figure, we can simply draw a rectangle as his upper body and a slightly slender rectangle as his legs below. His arms and hands can be painted on his body to show that he is explaining or demonstrating.

We can add some details and decorations as needed. You can add some textures or patterns to his shirt, or add some embellishments to his tie. These details can make stick figures more vivid and interesting.

Qian Qihu's contribution:

1. Protection engineering field: Qian Qihu has made important contributions in the field of protection engineering. He developed a variety of effective protective measures and technologies against various threats such as nuclear weapons, conventional weapons and natural disasters, which provided important guarantees for the safety of military facilities, industrial facilities and civilian facilities.

2. Underground engineering field: Qian Qihu has also made outstanding contributions in the field of underground engineering. He developed a variety of underground engineering design and construction methods, solved many difficult problems of underground engineering, and provided an important guarantee for the stability and safety of underground engineering.

3. Teaching and scientific research: Qian Qihu has also made outstanding contributions to teaching and scientific research. He devoted himself to training the younger generation of researchers, imparting his knowledge and experience to them, and trained a large number of outstanding talents in the fields of protection engineering and underground engineering in China.

4. Promoting the development of disciplines: Qian Qihu has also made positive contributions to the development of disciplines. He actively participated in various academic activities and exchanges, promoted the development of disciplines in the fields of protective engineering and underground engineering, and made important contributions to the progress of military science and technology in China.