According to the geological model for evaluating condition of hydrocarbon generation

an artifical neural network with three-layer networks

multi-imput and single output isbuilt. The hidden layer consists of four neural cells'This neural network can acquire weightby itself

and modify constantly the connections between the cells. The weight-assigned connections are automatically built by the artifical neural network

thus renewing the old methodof manned weight-assignment. This method is more objective and accurate.The method isused to evaluate the hydrocarbon generation condition of the Ordovician System in OrdosBasin

the result is basically the same as that of the expert system.