AIM:To discuss the value of CT diagnosis of adenoid cystic carcinoma in the lacrimal gland. METHODS:A detailed analysis of 26 cases （26 eyes） of adenoid cystic carcinoma in the lacrimal gland. RESULTS:The 26 cases consisted of 15 right eye illness and 11 left eye illness. Among all the cases, 15 of them exhibited round or oval pathological changes and distinct bound, 11 exhibited irregular sublobal changes and sawtooth bounds.The author also found an uneven dispatch of tumor and calcification. 26 pathological changes surrounded and oppressed the eyeball. In 14 cases, pathological changes grew from the outer eyepit to the inner eyepit and were confused with the eyestrings thus further affected the optic nerve. Orbital bone moth-eaten destruction was in 21 cases, osteolytic destruction in 5 cases. CONCLUSION:CT diagnosis is highly effective in determining adenoid cystic carcinoma in the lacrimal gland.