Many environmental and cultural factors affect the growth and development of women's championship sport in Iran, which can be classified into two groups: internal and external environmental factors. The first step in a balanced development process can be to identify these factors. The aim of this study was to investigate the internal environmental factors affecting the development of women's championship sport in Guilan province. The present study was applied in terms of objectives with a descriptive-survey nature. The statistical population consisted of all women active in the field of championship sport and the statistical sample was selected through purposive and convenience sampling method (n=351). The internal environmental questionnaires included 27 items in 3 dimensions and the development situation of the province included 22 items and 7 dimensions which were designed based on the 5-point Likert scale ranging from 1 to 5 (I completely disagree to I completely agree). The validity of the researcher-made questionnaire was confirmed by 21 sport management experts and its reliability was confirmed by Cronbach alpha test (0.83) and its composite reliability was also verified. Structural equation modeling in SPSS25 and PLS3 were used for data analysis and model fit examination. The results showed that internal environmental factors had a positive and significant effect on the development of women's championship sport and explained about 75% of this variable. Therefore, those authorities in the field of sport should pay special attention to the regular women's provincial league in different fields, the existence of policy making and strategic planning in women's sport, the systematic control and supervision of board performance and the use of extracurricular technology to grow and develop women's championship sport.