Abstract: In 2019,in the world market,the oil price was fluctuated due to lots of relevant factors,and in general had been going down,resulting in a worldwide negative influence on the steel tube industry. Analyzed here in the essay are the 2019 production and operation situations of the two world steel tube giants,Tenaris Group and Vallourec Group in terms of steel tube sales volume,profit ability,market distribution,balance sheet and debt-paying ability,etc. It is concluded via the analysis that though suffering some fluctuation,the business performances of the two groups in 2019 still had as a whole kept rather strong competitiveness;and Vallourec had realized counter-trend growth,having the highest EBITDA level over the recent years;the sharp dropping of global oil price in March brings about uncertain influences on the operation performance of Tenaris and Vallourec in 2020.