Mathorcup mathematical modeling needs to be defended. According to the relevant information, mathorcup Mathematical Modeling refers to MathorCup Mathematical Modeling Challenge for college students. The purpose of its development is to cultivate students' logical thinking ability to find, analyze and solve problems in the current era of cloud computing and big data, and to improve students' comprehensive ability to establish mathematical models and use computer technology to solve complex social and engineering problems in many industries. There is a defense session in the challenge, which requires participants to improvise and examine their comprehensive strength.