【Objective】The effects of 1-methylcyclopropene(1-MCP) treatments on storage quality and the postharvest physiology of seedless wampee, Clausena lansium， fruits were studied.【Method】The seedless wampee fruits grown in Guangdong Province were treated with 1-MCP (0.1 and 1.0 μL·L^-1 ) and stored at 25 ℃ for 10 days. The quality and physiology of fruits were investigated during the storage.【Result and conclusion】The respiration rate of fruit rose remarkably during storage, but no respiration climax was observed, which suggested that wampee fruit belonged to the later respiratory rising fruit. 1-MCP treatments at two levels of concentrations increased the good fruit rate and the edible rate of wampee fruits, maintained the fruit firmness, and decreased titratable acid and vitamin C contents. 1-MCP treatments also inhibited ethylene production and delayed the rise of respiration rate, delaying the decrease of SOD and POD activities and the increase of both cell membrane permeability and malondialdehyde content in fruit peel during the storage. 1.0 μL·L^-1 1-MCP is a more effective treatment.