Abstract: Objective：To establish the control charts for early warning of diarrhea based on the syndromic surveillance data from enteric clinic in Beijing. Methods: The outpatient data from enteric clinic of a Grade Three General hospital in Haidian district, Beijing from April 1 to Oct. 31, 2009 and from May 1 to Nov.10, 2010 were collected, according to the moving average method, the baseline calculated, the value of probability α and  μα, the early warning value based on the formula “w=X_j+μ_αS_j” calculated and the early warning control charts drew at last. Results: According to the harmfulness, the severity and controllability of diarrheal diseases, the value of probability α was determined as 0.01, then μ_α (unilateral) as 2, based on the early warning value, the control charts of diarrheal diseases, bacillary dysentery and other infectious diarrhea were established. Conclusion: The enteric clinic requires to further collect baseline data to evaluate and continuously adjust the established control charts for the best early warning model in accordance with the enteric clinic.

Key words: Outpatients, Diarrhea, Population surveillance, Early warning control chart