Investors can query the Brent crude oil futures index through websites such as Wenhua Finance and Golden Ten Data, and can also query the Brent crude oil futures index through some stock trading software, such as straight flush and Oriental Fortune. Take the straight flush as an example:

1. On the homepage of the straight flush, click the futures option.

2. In the futures interface, click the market option.

3. Click the international option.

4. In the international interface, click the Brent crude oil option.

When the price of Brent crude oil futures index is higher than the previous trading day, Brent crude oil futures index rises, which means that there are more bullish investors than bearish investors that day. On the contrary, when the price of Brent crude oil futures index is lower than the previous trading day, Brent crude oil futures index falls, which means that there are more bearish investors than bullish investors that day. When the index rises, investors can consider allocating some stocks related to crude oil, or doing more crude oil futures. When the index falls, investors can consider selling.