The formula for calculating the center of mass in the double integral of the postgraduate entrance examination is ∫∫D xdxdy= the abscissa area of the center of gravity × d, ∫∫D ydxdy= the ordinate area of the center of gravity × d.

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Advanced mathematics, as a compulsory subject in most professional postgraduate examinations, has its inherent characteristics, and its syllabus is almost unchanged. It pays attention to the investigation of basic knowledge points, students' comprehensive application ability and problem-solving skills.

As a necessary knowledge point in postgraduate mathematics, double integral has certain skills to follow in solving problems. In this paper, aiming at the investigation of the double integral of postgraduate entrance examination, some reference problem-solving skills are given The general calculation steps of double integral are as follows: draw a sketch of integral region d; According to the characteristics of integration region d and integrand function.