Objective To compare the pulse image models and parameter variations in healthy persons at Dashu （Great Heat

the 12th solar term）

Chushu （limit of heat

the 14th solar term） and Qiufen （autumnal equinox

the 16th solar term）.Methods The signals of 42 subjects were collected with precision smart robot pulse diagnosis information acquisition and analysis system on three days before and after Dashu

Chushu and Qiufen.The sine function harmonic fitting method was used to build the pulse image model and the least-squares regression method was used to analyze the pulse parameters.Results The pulse parameters were quite different between Dashu and Chushu and between Dashu and Qiufen.The pulse parameters between Chushu and Qiufen were slightly different.The pulse positions of left bar and right bar and harmonic phase 7 on the right inch were the important parameters to distinguish the pulse image at Dashu and Chushu.The pulse positions of left bar and right bar

harmonic phase 7 on the right inch and harmonic phase 9 on the left inch were the important parameters to distinguish the pulse image at Dashu and Qiufen.The harmonic phase 6 on the left inch

harmonic phase 11 on the left bar

harmonic phase 3 on the left cubit and energy 8 were the important parameters to distinguish the pulse image at Chushu and Qiufen.Comparing with Dashu in summer and Chushu and Qiufen in autumn

the selected parameters of the right hand were twice as many as those of the left hand.Comparing with Chushu and Qiufen in autumn

the selected parameters of the left hand were 2.8 times as many as those of the right hand.Conclusion The pulse parameters change obviously in summer and autumn.The pulse parameters change slightly at Chushu and Qiufen in autumn.The parameters of pulse position and frequency domain are more effective in classifying than the parameters of time domain.