This work gives an analysis of 317 inelastic interaction events. The angular and momenta distributions, etc., in the pion-nucleon centre of mass system (C.M.S.), of the secondary charged particles resulted from the collisions agree with the results of previous works and may be compared with the theoretical calculation based on the mechanism of peripheral collision.Those events in which the secondary protons are identified have been analysed as follows: (i) The total energy ω of all secondary particles except the protons in bary-centric system has been computed. The ideogram of ω distribution is given and is compared with the modified theoretical distribution calculated by Barashenkov et al. under the approximation of OPE model. At about ω= 1.5 BeV a peak has been found which is not given by the theoretical curve. Events in this peak have been preliminarily analysed. (2) By using the secondary protons of our events and those events of JINR under the same conditions, the coefficients of inelasticity, Kз, in "mirror" system have been computed. The distribution of Kз is given and is compared with the modified theoretical distribution calculated by Barashenkov et al. under the approximation of OPE model. Moreover, the events of different values of Kз have been analysed and discussed tentatively by means of the concept of target mass and using the method of F plot proposed by Duller Walker.