Sun Yubao is a senior economist, cost engineer, supervision engineer, consulting engineer and safety engineer. Engaged in engineering management in a large group company and worked as a part-time teacher in a school for many years. He has compiled teaching AIDS such as Test Sites and Selected Answers for Project Decision Analysis and Evaluation, and published more than 20 papers. He has many years of practical experience, and his teaching is simple and clear, which is very popular among students.