Abstract: The quality character and physiology and biochemistry were studied, which is base on field identification of radish. The electric conductivity percentage and high temperature cause death time was used menstruated heat tolerance of radish. Identification technique system for radish heat tolerance has been put forward in this paper, which combined with field identification and physiology identification. It includes three-kind independent methods: First, field identification that is with the heat injury index according to the fresh weight unit area of seedling and death rate of plant in summer. Second, yield identification that is including radish yield and effective root rate. Third, physiology identification that is including the electric conductivity percentage and high temperature cause death time. In the period of radish to grow leaf the fresh weight unit area was menstruate; and then in the period of radish to grow root the leaf heat injury index and death rate of plant in summer were menstruate, also the electric conductivity percentage or high temperature cause death time; Finally radish yield and effective root rate were menstruated in the harvests and accomplish to synthesize evaluation heat tolerance of radish. Three kinds of methods can be used alone, and also can be used together. It can receive the same result.