The division of combustion stage is significance to fire drive

which can guide the production design and control in site. However

the characteristics of the previous combustion stage division methods are one-sided without considering many factors

and the applicability of its parameter index is not strong. In order to obtain a more comprehensive combustion phase division and oil displacement characteristic of in situ combustion（ISC）

the characteristics of different fire drive stages are studied by the experiment of one-dimensional combustion tube and the comparison of numerical simulation and field example of ISC. Meanwhile

the production dynamics and the characteristics of combustion front propulsion in the process of in situ combustion are compared and analyzed. 10 parameters

such as yield increase multiple

water cut

air/oil ratio

oxygen content of production well

and combustion leading edge propulsion velocity

are selected for the stage analysis to obtain the stage characteristics

which is used as the index of stage division and contrast. The conventional fire drive is divided into four stages

while the fire drive after steam huff and puff is divided into five stages. The reference standard for the division of combustion stage is established

guiding the on-site production.