For the requirements of a large area dynamic detection for the speckle interferometry with a large viewing filed, a carrier frequency speckle interferometric system based on 4f imaging is proposed. The imaging system includes a wide-angle lens and the 4f imaging lenses. The carrier frequency is introduced by a double-slit aperture and a prism is attached to generate an adjustable shearing image. The relation among the distance of slits, imaging length and the carrier frequency is analyzed. The statistical averaging speckle size in the 4f imaging system is also calibrated by the self correlation of speckle field. The analysis results show that the 4f imaging system combined with a double-slit in a seperation of 1 mm and a 0.5° prism can produce 2π/3 carrier frequency in the 80 mm focus length. The 16 mm and 6 mm wide-angle lenses combined with the 4f imaging system are used to measure a rubber sheet and to demonstrate the proposed method. The experimental results show that this system can enlarge the viewing field and complete a speckle interferometric system with view angles of 40°and 65°. It concludes that the proposed system can adjust the carrier frequency and shear distance separately and can extend the dynamic detection area in a high efficiency.