Objective To understand the TCM constitution distribution in psoriasis patients in North China and the differences before and after ten years, and to analyze the changes in TCM constitution, so as to provide new ideas and methods for the prevention and treatment of psoriasis in this region. Methods A total of 1000 psoriasis patients admitted to the Department of Dermatology, Tianjin Academy of Traditional Chinese Medicine Affiliated Hospital from November 2008 to April 2009 and from April 2019 to September 2019 were selected for epidemiological investigation on their basic conditions and TCM constitution. The patients were guided to fill in the TCM Constitution Classification Scale and the Basic Situation Questionnaire for Psoriasis Patients. The Epidata 3.1 software was used to establish a database, and SPSS 13.0 was used for statistical analysis of TCM constitution distribution among different genders, different age groups and BMI indexes in 2019, as well as for analysis of the the difference analysis with the distribution of TCM constitution types in 2009. Results Except for the yin-deficiency constitution and the inherited special constitution, the distributions of the remaining constitutions between different genders were significantly different (P <0.05). The distributions of the balanced constitution, qi-deficiency constitution, yang-deficiency constitution, phlegm-dampness constitution, dampness-heat constitution, blood stasis constitution and qi stagnation constitution among different age groups were significantly different (P <0.05). The distributions of the balanced constitution, yin-deficiency constitution, phlegmdampness constitution and dampness-heat constitution among different BMI indexes were significantly different (P <0.05). Except for the qi-deficiency constitution and the inherited special constitution, the distributions of the remaining constitutions between 2009 and 2019 were significantly different (P <0.05). Conclusion The composition of TCM constitution in psoriasis patients has changed greatly over time. The main TCM constitution types in 2019 were yin-deficiency constitution, phlegm-dampness constitution and qi-deficiency constitution. Clinicians should conduct syndrome-differentiation and treatment based on the specific constitution types and guide the use of treatment drugs.