On January 27, the Shanghai Stock Exchange issued an inquiry letter to Yantai Yuancheng Gold Co.Ltd(600766) , requiring the company to explain the reasons and rationality for the significant increase in operating revenue and net profit in 2021, whether it conforms to the industry laws, and explain the recognition policies and basis of various revenues in combination with the business model, operation, sales contract terms, actual sales quantity and price of building materials, coal and other businesses, Whether there is a case where the revenue is recognized without meeting the conditions for revenue recognition, and whether there is a case where the total amount method is used to recognize the revenue instead of the net amount method; Supplementary disclosure of whether building materials, coal and other businesses have complete input, processing process and output capacity.