Science communication has seen a trend of diverse communicators in recent decades, who adopt different identity strategies to gain audience trust. This study focuses on the strategies used by three different groups of science communicators, including scientists, citizens and institutions, as well as the potential effects that may arise from these different strategies in terms of audience trust through quantitative content analysis. The findings show that communicators have biases towards using different strategies. There are also significant differences in the trust effects generated by different strategies used by different science communicators in different science topics. This indicates that the effect of science communication varies for different groups of science communicators and different science topics, and it is difficult to generate a universally applicable model, which further corresponds to the current trend of ‘diversification’ and ‘contextualization’ in science communication research.