The apparent activation energies and pre-exponential factors of the first order reaction are calculated in accordance with the Rock Eval data of 5 rock samples of the Tertiary Shahejie Formation buried in depth of 1801-3407min the Dongpu Depression.When the ratio x（the ratio of generated hydrocarbons amount to potential amount of hydrocarbon generation）is 0.05

then the activation energy E is 131 k Jmol

-1

and the factor A is 1.155×10

8

s

-1

.While x reaches 0.95

E then increases to 249.7kJ mol

-1

and A increases to 8.215×10

16

s

-1

.