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Ultrasonic three-dimensional imaging technology which can be used to obtain three dimension information of the inner structure is widely used in medical diagnosis. However, the three dimensional imaging for testing the industrial components is rarely reported, because of large calculation, high cost and long testing time. The spring flat steel sheet is one of the most important steel products for national economic construction. Quality control ability must be enhanced through three dimension imaging on the spring flat steel sheet. Ultrasonic three dimensional imaging is adopted to test the distribution of lamellar defects in spring flat steel, and the data abstraction and data rebuilding method are proposed. Moreover, the software for three dimension imaging with virtual instrument technology is also developed to implement algorithm of data rebuilding. The results indicate that the data extracted by the divided layer scanning of ultrasonic water immersion focusing method is applicable to three dimensional imaging, the data rebuilding method and related functional software can be used to show the three dimension distribution of lamellar defects in spring flat steel.