Progress has been made in research on heat-tolerant vegetable crops through the joint efforts of the Sino-Japanese scientists since November 1986. In Shanghai, vegetable breeding materials with heat tolerance have been selected from a total of 231 sweet pepper, cucumber and Chinese cabbage cultivars and new crossings were made. Significant effects on yield increase of sweet pepper and other crops were obtained in the experiments using different cover materials. Various methods for testing the heat tolerance of vegetable crops were studied and success was achieved, particularly in using the chlorophyll-meter to test the heat tolerance of cucumber crops.