Objective To have knowledge about the incidence type and severity of acne in 1 540 university students so as to look for an effective way to treat the acne under conditions of the university hospital.Method 1 540 university students with acne treated in our hospital were classified clinically according to six levels of the acne and they were graded clinically according to four levels of the acne

and the clinical grade and severity were analyzed.132 cases in the experimental group were treated with intravenous tinidazole and 98 cases in the control group were treated with peroral tinidazole and roxithromycin

and the therapeutic effects were compared.Results Acne of university students ranking the top three was papules

pustules

nodules with a respective percentage of 44.4%、17.4% and 16.7% while cysts

acne atrophica and acne conglobata seldom occurred.The severity of acne was I°、Ⅱ°、 Ⅲ° and Ⅳ°accounting for 76.1%、17.8%、4.3% and 1.8% respectively.Effective rate of the experimental group was 89.4%

which was higher than 55.1% of the control group

and the differences were statistically significant（χ2=6.305

p<0.01）.Conclusion The most acne that university students suffer from is papules

pustules

nodules and the severity is mainly I° and Ⅱ°.The therapeutic effect of tinidazole by intravenous drip infusion is better than that of peroral tinidazole in treating acne.