Advocating interest in learning under the policy of double reduction in background. Stimulating rural primary school students' interest in mathematics learning under the background of "Double Health Policy" is an important guarantee to improve the quality of mathematics teaching and an inevitable requirement to improve students' cognitive level. From the perspective of educational psychology, learning interest is a psychological feature that a person tends to know and learn to acquire some knowledge, and it is an internal force that can promote the growth of people's knowledge.