This paper deals with a cone heat-insulating coating of the meteorological rocket. On the basis. of the consideration for the environment conditions necessary and possible for the rocket cone，the following articles have been completed: Calculation of the temperature load for the materials in flight environments，selection of material of which the coating is composed and methods of shaping. The optimum thickness of the coating is determined by the simnlation experiments on the ground. Finally，the practical applicability of the heat-insulating coating is proved through the flight test.