From the table, it can be seen that the ROE of Maohua Shihua in 2016 is 7.18, the ROE in 2017 is 11.02, and the ROE in 2018 is 4.34. From this, it can be seen that the ROE of the enterprise is on the rise from 2016 to 2017, and the fluctuation range is relatively large, indicating that the investment income of the enterprise in 2017 is relatively high, which is what the investors of the enterprise are willing to see.However, the rate of return on net assets began to show a substantial decline in 2018, which indicates that the oil industry was in turmoil in 2018 and the profitability of enterprises declined due to poor investment returns.