The invention provides an online test and geological parameter based steam injection profile interpretation method for a thermal-production-well. The online test and geological parameter based steam injection profile interpretation method for the thermal-production-well comprises the steps of: step 1, establishing a steam flow heat-transfer model in a vertical pit-shaft; step 2, carrying out horizontal-section steam flow law simulation, and finding a relation among the temperature, the pressure variation and the flow rate; step 3, establishing a steam injection profile fuzzy evaluation model; and step 4, carrying out a reservoir steam injection profile interpretation in combination with online test data and geological parameters. The online test and geological parameter based steam injection profile interpretation method for the thermal-production-well guides the optimization of steam injection volume, the blowout opportunity and steam injection tubular column matching and further improves the benefits of viscous oil development.