Abstract: The multiplicity distributions and the correlations of shower, grey track and black track particles emerged in the forward( θ ≤90°) and backward ( θ >90°)hemisphere in case of 16 O-Em interactions at 4.5 AGeV/c are discussed in the paper. The results show that the distributions of gray and shower particles emerged in the forward and backward hemispheres are very different, but for black track particles no distinct difference is observed. The linear dependence of the multiplicity of produced particles in the forward and backward hemispheres is observed. The average values of shower and gray particles in the forward hemisphere increase strongly with the increasing of the number of shower and gray particles in the backward hemisphere, and this increasing slope increases with the increasing of beam masses (same energy). However, the mean number of gray and shower tracks in the backward increases weakly with the increasing of the number of gray and shower tracks in the forward hemisphere, and this increasing slope decreases with the increasing of beam masses (same energy).