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The polycyclic nitramine hexanitrohexaazaisowurtane(HNIW) is a compound of high energy density. HNIW can replace 1, 3, 5-trinitro-1, 3, 5-triazacyclohexane(RDX)or HMX, but its toxicity is unknown. In this paper,HNIW, hexabenzylhexaazaisowurtzitane ( HBIW ), tetraacetyldibenzulhexaazaisowurtzitane ( TADBIW ), tetraacetyldiformylhexaazaisowurtzitane(TADFIW) and tetraacetylhexaazaisowurtzitane(TAIW), which are intermediates of the synthesis of the HNIW, were selected as the tested objects in acute toxicity test, acute eye stimulation test and skin irritation test according to the standards of "chemical product testing method-401: acute oral toxicity test", "chemical product testing means-405: acute eye irritation/corrosion test" and "chemical product testing means-404: acute dermal irritation/corrosion test" of National Circumstance Protect Bureau. The results show that all of the five objects have no toxicity, no stimulation to eye and skin under the tested conditions.