Objective To analyse the characteristics of syndrome distribution in influenza-like cases.Methods The influenza-like cases were investigated by questionnaire of TCM syndromes.The syndrome analysis was conducted by using six-meridian syndrome differentiation

defense-qi-nutrient-blood syndrome differentiation and triple-energizer syndrome differentiation together.Results Among 478 influenza-like cases

465 were given syndrome analysis（other 13 were given the description of syndrome characteristics）.The pathogenic factors are mainly wind-heat

and warm-heat accounted for 98.9%.① The distribution of syndromes showed as follows: The cases with Taiyang syndrome accounted for 88%（syndrome of cold damage for 74.6% and Taiyang diseases accounted for 17.6%）

Shaoyang syndrome

56.6%（disease involving both Taiyang and Shaoyang

16.8%

Shaoyang diseases

2.4%）

Yangming syndrome

63.2% [disease involving both Taiyang and Yangming

21.5%

disease involving Taiyang

Shaoyang and Yangming（three Yang） 32%

disease involving both Yangming and Shaoyang

5.4%

Yangming diseases

4.3%].The cases with defense aspect syndrome accounted for 90.5%（single defense aspect syndrome accounted for 33.1%）

qi aspect syndrome

66.8%（disease involving both defense and qi aspects

57.4%

single qi aspect syndrome

9.5%）.There were a few cases with the syndrome of heat blockage in gallbladder（16.6%） and syndrome of heat obstruction in lung（11.8%）.The syndromes of lung-heat and bowel-excess（2.6%）

Yangming bowel syndrome（0.2%） and dampness-heat obstructing in the middle（1.1%） were uncommon.②Relationship between syndrome distribution and seasons showed that the occurrence ratio of Taiyang syndrome

Yaiyang disease

Yangming syndrome

Yangming disease

defense aspect syndrome

single defense aspect syndrome

qi aspect syndrome

single qi aspect syndrome

disease involving both defense and qi aspects

syndrome of heat blockage in gallbladder and syndrome of heat obstruction in lung had significant difference（P<0.05） in different seasons.③Relationship between syndrome distribution and disease course showed that the longer the disease course

the lower the occurrence ratio of single qi aspect syndrome

and the higher the occurrence ratio of qi aspect syndrome

disease involving both defense and qi aspects

Yangming syndrome

disease involving three Yang

syndrome of heat obstruction in lung and syndrome of heat blockage in gallbladder.Conclusion The influenza-like cases in Beijing area are mostly warm-heat disease and complicated diseases

among which disease involving three Yang

disease involving both Taiyang and Yangming and disease involving both Taiyang and Shaoyang are common.When the seasons and disease course are different

the distribution of some syndromes had significant difference.