Objective:To analyze the monitoring results of high resolution esophageal manometry (HRM) and 24-Hour impedance-pH for the patients with functional heartburn (FH)and non-erosive reflux disease(NERD), and explore the effect of Gastroesophageal junction morphology, transient lower esophageal sphincter relaxation and regurgitation of gastric acid in FH and NERD.Methods: 86 patients with continuous heartburn who were negative under endoscope were divided into FH group(38cases) and NERD group(48cases), and gastrointestinal symptom rating scales (GSRS), the results of HRM and 24h pH/impedance monitoring of the two groups were compared and analyzed.Results: The GSRS of sour regurgitation, abdominal distension, diarrhea and constipation of FH group were significantly higher than that of NERD group, respectively(t=-4.45,t=3.83,t=3.07,t=4.58,P<0.05). The ratio of esophagogastric junction-III(EGJ-III)of FH group was significantly lower than that of NERD group (Z=-3.27,P<0.05). And the ratio of esophageal hiatus hernia of FH group was significantly lower than that of NERD group(x2=16.01,P<0.05). In HRM parameters, the differences of lower esophageal sphincter pressure (LESP), upper esophageal sphincter pressure(UESP), distal contractile integral(DCI)and esophagogastric junction- contractile integral (EGJ-CI) between FH group and NERD group were statistically significant(t=6.99,t=-4.51,t=-2.91,t=-3.72;P<0.05), respectively. On the other hand, the times of sour regurgitation in erect position, the ratio of fluid regurgitation, exposed time of erect position and clinostatism, and DeMeester integral of NERD group was statistically significant higher than that of FH group(t=-9.48,t=-13.00,t=-13.56,t=-18.31;P<0.05).Conclusion:There are esophageal dysfunction in a certain degree and obvious regurgitation in both of two groups, and the detections of HRM and 24h-impedance pH contribute to differential diagnosis for NERG. Besides, the symptom of patients with FH may be relative with regurgitation of non-acidic material, especially may be relative with regurgitation of air.