Abstarct: In today's domestic and international markets, the brand is turned to be one of the main plaxyers in business, and any company which is able to have a word to say, will win this race. Therefore, nowadays, investment on consumers’ relationship with brands has become an important issue for those companies which are looking for survival and constant sustainable profits by the help of their customers. Brand trust and brand advocacy are among the most important relationships that are important elements in marketing. In this research, the effect of brand trust on brand advocacy is investigated by considering the three factors of affective brand commitment, brand loyalty and electronic word-of-mouth advertising among the customers of five brands active in the food industry in the field of compote and canned food production, which are located in Razavi Khorasan province, have been discussed. In this regard, a new conceptual frxamework has been established in which the five discussed variables have been integrated with each other and the relationship between them and how they affect each other has been evaluated. This thesis is applied in terms of purpose, a survey research in terms of data collection method and a descxriptive analytical research in terms of research method. The statistical population of this research consists of customers who are fans of 5 famous brands in the compote and canned food industry, and in order to collect the data required for the research, 500 questionnaires (100 questionnaires for each brand) were distributed among the respondents. The research model and hypotheses were evaluated using partial least squares technique and Smart-PLS software. The results of this research confirmed the existence of a positive and significant relationship between brand trust on affective brand commitment, brand loyalty and electronic word-of-mouth advertising. Also, according to the results of this research, brand loyalty and electronic word-of-mouth advertising have a positive and significant relationship with brand advocacy. In addition, the mediating role of brand loyalty and electronic word-of-mouth advertising in the relationship between brand trust and brand advocacy was confirmed.