Objective: Analyze the relationship and influence of training with the performance of small and medium enterprises in Ciudad Obregón, Sonora, Mexico. To generate proposals for improvement. Hypothesis: H1: The training and the elements that make up this, relate and positively and significantly influence the performance of the small and medium enterprises of Ciudad Obregón. Methodology: A quantitative methodology was used, it has a descriptive-correlational scope with a non-experimental design (Hernandez, Fernandez, and Baptista 2010) of cross-section (Creswell, 2009); Linear regression analysis and the method of ordinary least squares were used. SMEs from the commercial, industrial and services sector were studied in Ciudad Obregón, Sonora, with a non-probabilistic sample and at the convenience of 195 companies. The instrument covered the training and performance variables, with 70 items, a five-point Likert scale. Contribution: Improving the performance of the SME allows it to strengthen itself as an organization, which will contribute to its permanence in the market, therefore maintaining the sources of employment, which is currently very difficult; and the mechanism to achieve this is training, especially if there is a connection with universities through professional practices.