CSI official website. For etf valuation, you can check the index valuation during the period of 10, and you can query the index valuation through official website of China Securities Index Co., Ltd. The specific process is as follows: 0 1 Enter China Securities Index Co., Ltd. on your mobile phone or computer browser. The valuation method is to look at the PE and PB valuations of ETF index funds, buy when undervalued and sell when overvalued.