In November 1996, we made an investigation among 1194 students from 25 of grade 2 classes at 4 middle schools in our city. The result shows that a total of 13 different kinds of injuries happened to the students, with a rate of 81.66%. Among which, 7 kinds of injuries took the first 7 places: injuries from falls (39.78%), knife-cutting (37.68%), throat injuries by sharp bone blocks (36.09%), traffic accidents (18.17%), bumping to sharp materials (17.08%), burns (17.08%) and by sharp-weapon hurt (16.83%). We also made an investigation on the causes and characteristics and related factors of injuries. Thus some preventive measures were preliminarily put out.