The purpose of this study is to evaluate the efficacy of proton pump inhibitor for the treatment of non-erosive reflux disease (NERD) in Chinese population. Studies from the western population have estimated a worldwide prevalence of gastro-oesophageal reflux disease from 10 to 20 %. Monthly symptoms of heartburn or acid regurgitation were found in 9.3% of subjects according to a population survey in Hong Kong. Most of these patients did not show evidence of erosive change during upper endoscopy. However, patients with NERD suffer from similar impairment of quality of life as patients with erosive oesophagitis and their symptoms are as severe as patients with erosive disease. Data on the use of proton pump inhibitor for the treatment of NERD in Chinese patients are scanty. Thus we want to perform a double-blind randomised placebo-controlled study to evaluate the efficacy of proton pump inhibitor for the treatment of NERD in Chinese population.