Two studies examined the effects of four types of teachers' evaluative feedback on Chinese students' self-efficacy in English vocabulary acquisition. In Study 1, a random sample of Grade 8 students (N = 79) learned prefixes and received either formative or summative feedback after failure in test. The results showed that students who received summative feedback showed a larger decrease in their self-efficacy than those who received formative feedback. In Study 2, a random sample of Grade 7 students (N = 77) went through similar procedures as in Study 1 except that students received either self-referenced or norm-referenced feedback. The results showed that self-referenced feedback was more beneficial to students' self-efficacy than norm-referenced feedback. The influences of teachers' evaluation and feedback on students' self-efficacy are discussed.