Photobiology and Photomedicine are newly developing and intersecting subjects that research on life by means of photons.In the recent few years,flourishing Photobiology and Photomedicine have been the topic of general interest and concern in the field of optics and bio medicine.The sixth Chinese Symposium of Photobiology and Photomedicine was held successfully in Kunming during the period from 27 July to 2 August 1999.Significant progress was achieved in a variety of primary divisions such as Photo tissue interaction,Photodynamic effect and biochemical effect,Biophoton emission,Photo biomedicine engineering,Monitoring of biomedicine,and Clinical application of Photo biomedicine.