Ji 'nan Erqi Collection includes: Wang Sheren Collection, Wang Za Collection, etc. At first, it mainly bought and sold agricultural and sideline products, and later it developed into a flea market, commonly known as "flea market". On the second and seventh day of the lunar calendar, the stalls next to them sell secondhand goods, such as old clothes, shoes and hats, old clocks, old farm tools and furniture, old stoves and chimneys, old pots and pans, old pots and pans and old newspapers.