INTRODUCTIONAt present,ultrasonic doppler is used to examine blood circulation in big vessels in clinic,but there isnt still good and simple method for examination of blood circulation and vascular functions of limbs end and infrared thermography has some advantage in this aspect.It is well known that Raynaud phenomenon is caused by spasm and lesion of small end vessels of limbs.In clinic,provocation test might be used to provoke its onset and acknowledge of reaction condition of provocation in healthy people is the premise to judge abnormality and other lesions.