Abstract: Declining pressure data are mainly used in the common fracturing well test analysis.However,the data,from rocks to be fractured to pumps to be stopped,are not utilized effectively.At the same time,in the process of fracturing construction,extended fractures are not monitored dynamically either.The technology of model automatic identification of hydraulic fracture proposed can accurately analyze fracturing construction pressure data from rocks to be fractured to pumps to be stopped.Using the analytical software of fracturing construction pressure can confirm automatically fracture model and calculate fracture dynamic parameters,such as the length,the width of fracture and so on.On the basis of that,in the fracturing construction,we can know timely growth,development and close of fracture.It is very significant to correctly direct fracturing construction and obtain fracture with high quality.