Borderline personality disorder (BPD) is characterized by emotional dysregulation. Prior research on facial emotion recognition has revealed that BPD individuals have emotion perception abnormalities. This study examined whether these findings extended to emotional speech recognition. Mandarin emotional speech (neutral, angry, happy, and sad) was synthesized at varying emotional intensities by adjusting the fundamental frequency. A perceptual experiment was conducted with Chinese university students with high and low borderline personality features (BPF). High-BPF participants showed lower accuracy in identifying neutral speech, more frequently misidentifying it as other emotions, and were less accurate in identifying high-intensity happy speech, tending to misclassify it as neutral. They also exhibited marginally higher confidence in recognizing angry speech. The results contribute to the phenomenological understanding of emotional dysregulation in BPD.