Shandong people. Qi Lin, born in Jinan, Shandong Province, is a teacher of Beijing Aipu Zhiliang Technology Co., Ltd. Qi Lin, national 199 logic guidance expert for management entrance examination. He used to be the head of the logic teaching and research group of many well-known postgraduate institutions, the national university consulting expert, and the chief lecturer of high-end VIP logic teaching, focusing on the teaching and research of formal logic and informal logic for many years.