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...