The contact heating directly affects operation performance of the electrical switch and it is necessary to determine the temperature rise of the contact surface.For overcoming such defect as weak accuracy of single point contact model

a kind of common temperature rise modeling method of contacting surface of contact is given with combination of the heat transfer theory and with consideration of randomness of thermal contact resistance of the contact and the multi-point contact.Both the temperature rise modeling method after considering thermal resistance of the contact and the structure modeling method of multi-point stochastic contact are studied and considered

and the specific calculation model and achievement process are given.The test results show that the contact thermal resistance can reflect effectively the temperature difference between the contact and the target surface.The constructed modeling method of multi-point stochastic contact can reflect correctly the spot size and the influence of the number of the spots on temperature rise.This method is universal and the use of which can generate automatically the spot number and the stochastic contact model with variable size as well as calculate the temperature rise distribution of contacting surface of the contact.