[en] The analysis of experimental data on angular distributions of neutrons from heavy ion reactions on intermediate mass and heavy nuclei has been carried out. The intereactions of the ¹²Cu and ²²Ne ions with Ge, Mo, Ag, ¹⁴¹Pr nuclei and ¹⁶O and ⁴⁰Ar ion interaction have been studied. The fission of ¹⁹⁷AU, ²⁰⁹Bi, ²³⁸U nuclei under the action of ¹²C, ¹⁶O, ²²Ne ions and also fission of ¹⁹⁷Au, ²⁰⁹Bi nuclei under the action of ⁴⁰Ar ions has been investigated. Satisfactory agreement of experimental neUtron anisotropy with the calculated values of the theory of compound nucleus neutron angular distribution at definite choice of temperature parameters has been obtained for weak fissile nuclei. The comparison of experimental and calcUlation results for strong fissile nuclei shows that neutrons are emitted by perfectly accelerated fragments. Part of the anisotropy in this case is explained by the kinematic reflection of the fxssion fragment anisotropy, and part by self-anisotropy of neutrons connected with angular momentum of emitting fission fragments