PURPOSE: To provide a textile structure, particularly a composite nonwoven structure, and its preparation method.

CONSTITUTION: The composite nonwoven structure comprises a first fiber being a melt-blown microfiber and a second fiber which is made of a substantially single polymer or a polymer alloy and has heterogeneous melt viscosity and a substantially constant melting point on the cross section or has heterogeneous melt viscosity on the cross section and at least about one third surface melt flow rate of that of the first fiber. The composite nonwoven structure is prepared by alternately and thermally combining at least one layer of the first fiber with at least one layer of the second fiber.