The performance of a basin-type insulator is directly related to the overall insulation capability of gas insulated switchgear（GIS）

and how to effectively assess the aging condition and residual life expectancy of the insulator still remains one of the research hotspots. Computational estimation of the thermal kinetic parameters of the basin-type insulator is taken as a feasible technological scheme. Based on comprehensive analysis on the traditional thermal decomposition methods such as Agrawal

a more reliable and accurate method is proposed in this paper

which is specifically applied to calculate the thermal kinetic parameters of the basin-type insulator. The research results show that the three thermal kinetic factors of the insulation material can be obtained simultaneously

with a higher reliability in figuring out the reaction mechanism function. The micro-mechanism of the thermal decomposition process of the basin-type insulator is explained

and the pyrolysis can be divided into three temperature stages. The apparent activation energy E and the apparent pre-exponential factor A at the three temperature stages are in an increasing state

and the reaction mechanism of the three stages is different. The proposed research facilitates an easy and reliable calculation of the thermal kinetic parameters

which presents effective technological methods for further evaluating the aging status and residual life expectancy of the basin insulators.