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Based on a specially designed optical structure,an efficient cascaded third-harmonic-generation (THG) output of a 1064-nm,pico-seconds pulse laser is successively realized by using an NH4H2PO4 (ADP) crystal that acts as the secondharmonic-generation component and sum-frequency-generation component.The maximum THG output is 1.61 mJ,and the highest conversion efficiency from 1064 nm to 355 nm reaches 35％,which are obviously superior to the results obtained using a KDP crystal under the same circumstance.The further phase-matching analysis indicates that this THG configuration of ADP crystal can be applied to various fundamental wavelengths in a range of 1 μm-1.1 μm.Compared with the previously reported KDP THG converter,which is based on a similar principle,the present ADP THG converter is favorable for large-energy,high-efficiency operation because of the larger effective nonlinear optical coefficient deff and higher laser damage threshold.