Abstract: The structure of the new U₃Si₂-Al fuel plates subassembly is very complex, and experience and criterion of its structural material, manufacture technicality, mechanics capability and running property are lack. To attain various capability parameters of this new fuel subassembly, a series of engineering validate test and investigation were developed, concluding mechanics capability test of fuel blanket and structural material, thermal property and thermal stability test of fuel plates and blanket material, mechanics capability test of fuel plates, positron annihilate life test and waterpower erode and disassembly test of fuel subassembly, etc. The attained various test data provide important gist on structural design, dependability analysis and safety auditing of fuel-subassembly, and provide reference on machining manufacture, reactor use and manager of fuel subassembly.